Do you think necessary to do a bird coun...

Do you think necessary to do a bird count ?

Yes , we must count them at least once a year

A． it

B． that

C． we

D． they

A 【解析】试题分析：it是人称代词，代替前面提到的物，而it还有一个特殊的用法就是充当形式主语或宾语，真正的宾语或主语是动词不定式，这个知识点是考试的重点。此句的含义是你认为数鸟必要吗？其中to do a bird count是真正的宾语，形式宾语是it，故选A。考点：it的特殊用法。

考点分析：

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