1.The zoo keeper is worried because the number of visitors__

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1.The zoo keeper is worried because the number of visitors__smaller and smaller.
A is becoming B have become C.become D.became
（为什么用现在进行时?）
2.The skirt () is made of silk is very expensive .I can't afford it
A what B/ C that D it
（选 B ）

1、现在正在进行时可以表示正在发生的动作,也可能继续下去,参观者的数量正在减少,不排除继续下去的可能,so A is the correct answer !
2、不行!() is made of silk 修饰 skirt 选B缺少形式主语!选A正解!

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