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The zoo keeper is very woried because the numbei of visitors

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The zoo keeper is very woried because the numbei of visitors _____smaller and smaller.
空格上为什么不是is becaming (正确答案是became)
The zoo keeper is very woried because the numbei of visitors
这个的意思是说已经变得越来越少,强调是过去式,所以用过去式became.如果是用is becoming的话,就是表示将来式或现在进行时,于题意不服.动物园管理非常担心因为游客即将变得越来越少?不通顺哟.但能想到the number of n词复数 句型要加谓语动词单数已经是比较细心啦.