The weather turned out to be fine yesterday. I          the trouble to carry my umbrella.
A．needn’t takeB．couldn’t take
C．needn’t have takenD．couldn’t have taken
C

試題分析：句意:昨天的天氣證明是晴天，我沒有必要麻煩帶著一把雨傘。這里是對(duì)過去的虛擬，needn’t have done指過去沒有必要做某事而做了，故選C。
點(diǎn)評(píng)：本題難度適中。虛擬語氣是高中階段的重要語法項(xiàng)目，需要考生牢記各種情況的虛擬語氣的謂語動(dòng)詞的形式，并要有分析理解語境的能力。
即學(xué)即練：—I heard the phone ringing in the office next door.
—You ________ it. They haven’t got a phone yet.
A.couldn’t hear        B.couldn’t have heard
C.didn’t hear           D.wouldn’t have heard
解析：B。由句意可知此處是對(duì)過去的事情表示推測(cè)，那么否定句用“can/could not+完成時(shí)”，故選B。
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