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【题目】 This produced a chain reaction, _______ made _______ possible for life to develop.

A. what; that B. which; it

C. when; that D. how; it

【答案】B

【解析】

试题分析:考查定语从句和it用法。句意是:这产生一个链条反应,这个反应使生活发展变成可能。前面整个句子做先行词,后面是which引导的非限制性定语从句;第二空是it作形式宾语,动词不定式做真正的宾语。故选B。

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