The zookeeper is worried because the number of visitors____smaller and smaller.A.become B.became C.is becoming D.have become为什么不选D呢?“smaller and smaller”是越来越少,用现完,表示过去就开始减少了到现在越来越少了,

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The zookeeper is worried because the number of visitors____smaller and smaller.A.become B.became C.is becoming D.have become为什么不选D呢?“smaller and smaller”是越来越少,用现完,表示过去就开始减少了到现在越来越少了,
The zookeeper is worried because the number of visitors____smaller and smaller.
A.become B.became C.is becoming D.have become
为什么不选D呢?“smaller and smaller”是越来越少,用现完,表示过去就开始减少了到现在越来越少了,也表示过去发生对现在的影响啊,为什么不用现完?

The zookeeper is worried because the number of visitors____smaller and smaller.A.become B.became C.is becoming D.have become为什么不选D呢?“smaller and smaller”是越来越少,用现完,表示过去就开始减少了到现在越来越少了,
the number of 作主语时谓语动词要用单数,只有C对.
加油!不明白再问!

选C 前面是一般现在时 后面时态一致

　　这是一个常考的题目，选择C，使用现在进行时是用来强调人数越来越少的情况是一直在发生的，强调了情况的严重性。

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答：本题主考主谓一致。本句的主语是The number, 排除AD

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