----_____is it that is troubling Mary ?----Working out the maths problem..A．What

题型：不详难度：来源：

----_____is it that is troubling Mary ?
----Working out the maths problem..

A．What　

B．How

C．Why　　

D．Which

答案

解析

考查表语从句。从句中缺少逻辑表语，故选A，是什么让玛丽很烦？

举一反三

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A．why

B．which

C．when

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A．That

B．As

C．Which

D．It

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A．the largest of which	B．of which largest
C．which the largest	D．in which the largest

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A．when

B．that

C．whenever

D．that when

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A．which ; that

B．which ; which

C．that ; which

D．that ; that

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