A beam of light will not bend round corners unless______to do so with the help o
题型：不详难度：来源：
A beam of light will not bend round corners unless______to do so with the help of a reflecting device . | A．having been made | B．being made | C．made | D．you make |
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答案
| C |
解析
| unless引起条件状语从句中后面省略了it was。 |
举一反三
What would have happened ______,as far as the river bank ?| A．Bob had walked farther | B．If Bob should walk farther | | C．Had Bob walked farther | D．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 heard | B．did I hear | C．I had heard | D．I heard |
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To tell the truth, I won’t go to the party_______. | A．so as to invite | B．even if invited | C．if inviting | D．if invite |
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— Shall Mary come to the concert with us？
－Not_____she has finished her paper．| A．since | B．once | C．when | D．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______. |
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