----_____is it that is troubling Mary ?----Working out the maths problem..A．WhatB．HowC．WhyD．Which-高中英语-n多题

◎ 题干

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

A．What　

B．How

C．Why　　

D．Which

◎ 答案

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◎ 解析

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◎ 知识点

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