※ 引述《surfeit (lissome)》之銘言：
: When questioned,the students denied _________ the practical joke.
: A.to play
: B.to have played
: C.playing
: D.having played
: 這題答案是D
: 詳解是寫deny+Ving
: 那為何不選C呢?
關鍵在"denied"
前一句還原變成When they were questioned, the students denied...
因為denied是過去式所以說他們否認惡作劇是發生在否認這件事更之前 所以說必須是完
成式（have+pp)又因為deny後ving所以having denied
這樣來的
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