- Hi, Jack. What’s that on the desk?- Oh, it’s the new backpack my mom gave me for my birthday.A. when B. what C. which D. where 题目和参考答案——青夏教育精英家教网—

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— Hi, Jack. What’s that on the desk?

— Oh, it’s the new backpack my mom gave me for my birthday.

A. when B. what C. which D. where

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