题目内容
We students should treasure the short senior school’s study life of three years. Once ________, the opportunity can’t get back.
| A．losing | B．was lost | C．lost | D．being lost |
C
解析试题分析：考查状语从句的省略：句意：我们每个学生应该珍惜短暂的三年高中学习生活，一旦失去了，机会不再来。Once引导的是条件状语从句，是省略句，完整的是once the short senior school’s study life is lost，主从句主语一致的时候，主语和be动词可以省略，选C。
考点：考查状语从句的省略
— Oh, how depressed! I’m bound to lose to him in tomorrow’s competition.
—Cheer up! In fact, he is _________ than you.
| A．not more nervous | B．no more nervous |
| C．no less nervous | D．a little less nervous |
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| A．didn’t he | B．did he | C．wasn’t she | D．was she |
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| A．lay | B．lie | C．lies | D．laid |
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| A．whether | B．what | C．that | D．if |
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| A．is it that | B．was it which | C．it is what | D．it was that |
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| A．which；which | B．which；that |
| C．that；where | D．where；where |
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| A．wouldn’t you | B．did you | C．didn’t he | D．am not I |