A. | couldn't have come | B. | needn't have come | ||
C. | shouldn't have come | D. | mustn't have come |
分析 你本不必親自來;一個電話就足夠了.
解答 答案是B.本題考查"情態(tài)動詞+have done"的結(jié)構(gòu).couldn't have done表示推測,表示"不可能已經(jīng)…";needn't have done是虛擬語氣,表示"本不必做,但事實上做了";shouldn't have done是虛擬語氣,表示"本不應(yīng)做但事實上卻做了";沒有mustn't have done.題干表達(dá)的意思是"你本不必親自來",由此判斷答案選擇B.
點評 在掌握虛擬語氣的規(guī)則的基礎(chǔ)上,判斷題干屬于什么類型的虛擬,然后根據(jù)語境,選用恰當(dāng)?shù)膭釉~形式表達(dá)虛擬.
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