----is it that is troubling Mary ?----Working out the maths problem..A. What　B. HowC. Why

发布时间：2020-08-16 11:27:32


----    is it that is troubling Mary ?
----Working out the maths problem..
A. What　
B. How
C. Why　　
D. Which

网友回答

(答案→)A. What　
B. How
C. Why　　
D. Which
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？
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