Had the boy worked harder, he ______ the exam.
A．must have got throughB．could get through
C．ought to get throughD．would have got through
D

試題分析：句意：如果那個小男孩再努力一點，他就能通過考試。這里是省略了if連詞的條件狀語從句，這里根據(jù)從句的謂語動詞可知是對過去的虛擬，所以主句用would have done，故選D。
點評：本題難度適中。虛擬語氣是高中階段的重要語法項目，需要考生牢記各種情況的虛擬語氣的謂語動詞的形式，并要有分析理解語境的能力。
即學即練：—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過去的事情表示推測，那么否定句用“can/could not+完成時”，故選B。
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