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

試題分析：句意：就是在瑪麗讀了文章之后，她才意識到她面前的家庭作業(yè)非常的難完成。這個句子中含有It was，首先要考慮它是不是一個強調(diào)句，把It was和橫線去掉，這個句子仍然結(jié)構(gòu)完整，語義清楚，所以說這個句子就是一個強調(diào)句，選B。
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