The number of air crashes that _______ in developing countries _________ increasing.

A. happens; is B. happen; is

C. happens; are D. happen; are

B

【解析】

試題分析：考查主謂一致，第一個(gè)that 后面為定語從句，缺少謂語，主語為air crashes,故謂語動(dòng)詞用復(fù)數(shù)形式happen;第二空主語為the number of意為“．．．的數(shù)量”，謂語動(dòng)詞用單數(shù)形式is。句意：發(fā)生在發(fā)展中國(guó)家的飛機(jī)失事事件正在增加。

考點(diǎn)：考查主謂一致

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