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

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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 turned off
D、would have turned off

答案A

解析 it is proposed that后面要使用虚拟语气——(should)+动词原形,因此选A。
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