【題目】 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】

試題分析:考查定語(yǔ)從句和it用法。句意是:這產(chǎn)生一個(gè)鏈條反應(yīng),這個(gè)反應(yīng)使生活發(fā)展變成可能。前面整個(gè)句子做先行詞,后面是which引導(dǎo)的非限制性定語(yǔ)從句;第二空是it作形式賓語(yǔ),動(dòng)詞不定式做真正的賓語(yǔ)。故選B。

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