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题目
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A beam of light will not bend round corners unless______to do so with the help of a reflecting device . 
A.having been madeB.being madeC.madeD.you make

答案
C
解析
unless引起条件状语从句中后面省略了it was。
核心考点
试题【A beam of light will not bend round corners unless______to do so with the help o】;主要考察你对倒装句等知识点的理解。[详细]
举一反三
What would have happened ______,as far as the river bank ?
A.Bob had walked fartherB.If Bob should walk farther
C.Had Bob walked fartherD.If Bob walked farther

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John talked with me for about an hour yesterday. Never _______ him talk so much.
A.had I heardB.did I hearC.I had heardD.I heard

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To tell the truth, I won’t go to the party_______.
A.so as to inviteB.even if invitedC.if invitingD.if invite

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— Shall Mary come to the concert with us?
-Not_____she has finished her paper.
A.sinceB.onceC.whenD.unless

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-Why didn’t Tom give you one of his paintings? 
-I didn’t want one,but he would have given me one if I______.
A.didB.wouldC.willD.had

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