The number of traffic accidents that _______ in developing countries _______ increasing.
A．happen; is B．happens; isC．happens; areD．happen; are
A
第一空考查時態(tài)，在發(fā)展中國家發(fā)生的事，用一般現(xiàn)在時，第二空考查主謂一致，主語是the number of+名詞復(fù)數(shù)，謂語用單數(shù)，句意是：發(fā)展中國家發(fā)生的交通事故的數(shù)量正在增加。選A。
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