题目内容

The number of traffic accidents that _______ in developing countries _______ increasing.
A．happen; is B．happens; isC．happens; areD．happen; are
A
第一空考查时态，在发展中国家发生的事，用一般现在时，第二空考查主谓一致，主语是the number of+名词复数，谓语用单数，句意是：发展中国家发生的交通事故的数量正在增加。选A。
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