※ 引述《yanstlyef (IPA 我討厭你)》之銘言：
: You should _______ Tom last Friday.
: A)help B)helped C)helping D)have helped
: the correct answer is D, how about A?
: how to explain it?
: thank you
should + have + pp = 應該要做而未做
由於時間是last Friday
所以明顯是指該事件並未完成
故選 (D)
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