【題目】Mr Brown was too busy ______ our papers _______ this question.
A.to mark, to answer
B.to mark, answering
C.marking, answering
D.marking, to answer

【答案】D
【解析】句意:布朗先生忙著寫論文來回答這個問題。根據(jù)句意可知布朗先生正在寫論文,然而寫論文這個事情是發(fā)生在過去,所以要用過去進行時,所以要用making,這里面寫論文是為了回答問題,表示目的所以answer之前應該加to。故選D。

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