A. | unless | B. | once | C. | after | D. | since |
分析 ---麦克,让我们准备棒球赛吧.
---好的,如果我们不尽力我们就会输.
解答 答案:A.unless如果不,once曾经,after之后,since自从,结合We'll lose the game ______ we try our best用unless表示如果不,引导的条件状语从句,故答案是A.
点评 unless是从属连词,引导条件状语从句,含有否定意义,相当于if条件状语从句的否定形式.所以unless=if not.注意:unless引导的条件状语从句和if条件状语从句,与其它时间状语从句一样,用一般现在时代替将来时.
1.Unless you take more care,you'll have an accident.
(如果不多加小心的话,你会出事故的.)
2.My baby sister never cries unless she is hungry.
(我那刚出生的妹妹除非饿了,否则她是从来不哭的.)
3.Unless bad weather stops me,I jog every day.
(除非坏天气阻拦我,否则每天我都慢跑的.)
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