【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(xiě)論文來(lái)回答這個(gè)問(wèn)題。根據(jù)句意可知布朗先生正在寫(xiě)論文,然而寫(xiě)論文這個(gè)事情是發(fā)生在過(guò)去,所以要用過(guò)去進(jìn)行時(shí),所以要用making,這里面寫(xiě)論文是為了回答問(wèn)題,表示目的所以answer之前應(yīng)該加to。故選D。

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