题目内容

It was only after she had read the papers _______ Mary realized the homework before her was extremely difficult to complete.
A．whenB．thatC．whichD．what
B

试题分析：句意：就是在玛丽读了文章之后，她才意识到她面前的家庭作业非常的难完成。这个句子中含有It was，首先要考虑它是不是一个强调句，把It was和横线去掉，这个句子仍然结构完整，语义清楚，所以说这个句子就是一个强调句，选B。
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