—There’s someone knocking at the door. Who could______be?—I have no idea.

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问题 —There’s someone knocking at the door. Who could______be?—I have no idea.

选项 A、he
B、it
C、she
D、that

答案B

解析本题考点是代词it的用法。在there be句型中应用it来指代主语部分，它所构成的反意疑问句也是这样，当不明确某人身份时，通常用中性代词it来指代某人。如：There is nobody in the room，isn’t it?此句中因为代词指代的是“someone knocking at the door”，因此用it，所以选项B为正确答案。

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本试题收录于：英语题库普高专升本分类