问题

Tom says he ______ you and is helping you with the research at present.

A:had called on
B:will call on
C:has called on
D:called on;

正确答案是：

同类题型

下列句子中加横线的字解释不正确的一项是

er why the thinnest plastics bags, though ________ , are still in use here—Well,it’s no easy job to solve this problem effectively

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