题目内容
【题目】【2014 甘肃白银】The zoo keeper is worried because the number of visitors _______ smaller and smaller.
A. become B. are becoming
C. is becoming D. have become
【答案】C
【解析】
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,the number of………的总数,做主语看做单数,故选C。
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