When Edison died, it was proposed that the Americans______all power in their homes, streets and factories for several minutes in

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问题 When Edison died, it was proposed that the Americans______all power in their homes, streets and factories for several minutes in honor of this great man.

选项 A、turn off
B、turned off
C、must turn off
D、would have turned off

答案A

解析 It is/was proposed/that…后的从句用虚拟语气,动词形式为“should十动词原形”,should可省略。
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