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The zoo keeper is worried because the number of visitors ______ smaller and smaller .
A.is becomingB.becomeC.becameD.to become
A

试题分析:动物园饲养员很担心,因为游客的数量越来越少。结合语境可知下文为原因状语从句,描述的是现在正在进行的动作,故用现在进行时态,选A。
点评:英语中的时态主要是借助于时间状语与上下文语境来进行判断。解答此类题型,首先要注意句子中的时间状语,如果没有则要通过分析上下文,结合语境来判断句子的时态。英语疑问句中一般具有时态上的对应关系,注意结合这一特点进行区分。
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