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You must keep on working in the evening________you are sure you can finish the task in time.

A.as                                                      B.if

C.when                                                 D.unless

D 本题考查连词的用法。unless意为“除非……(否则)”,引导状语从句。根据句意可知应选D项。

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              RichardSolo 1800 Rechargeable Battery

     In just minutes a day, plug in and charge your iPhone quickly!

    Just plug RichardSolo 1800 into your iPhone once or twice a day, for fifteen minutes, and keep your iPhone charged up. At your desk, or at dinner, plug RichardSolo into iPhone to instantly transfer change. No more battery worries. RichardSolo will charge iPhone to full 1.5 time, and it is good for 3-5 years of recharges.

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RichardSolo 1800 is largest in its class and holds its charge for months. Works with almost all iPhone cases.

Your satisfaction is guaranteed, with our 30-day return privilege. If you're not satisfied for any reason, we'll email you a pre-paid return label.

Actual customer comments:

To have your company exhibit such good service is unbelievably refreshing. ---P.S.

This is what I call great customer support. I wish more companies would figure this out these days. Thank you so much.---D.C.

You have provided me one of the best services I have ever seen on any online/telephone shopping.--T.K.

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RichardSolo 1800 Rechargeable Battery
In just minutes a day, plug in and charge your iPhone quickly!
Just plug RichardSolo 1800 into your iPhone once or twice a day, for fifteen minutes, and keep your iPhone charged up. At your desk, or at dinner, plug RichardSolo into iPhone to instantly transfer charge. No more battery worries. RichardSolo will charge iPhone to full 1.5 times, and it is good for 3-5 years of recharges.
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Your satisfaction is guaranteed, with our 30-day return privilege. If you’re not satisfied for any reason, we’ll email you a pre-paid return label.
Actual customer comments:
To have your company exhibit such good service is unbelievably refreshing. —P.S.
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