If the earth suddenly______spinning, we would all fly off it.

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问题 If the earth suddenly______spinning, we would all fly off it.

选项 A、had stopped
B、stopped
C、has stopped
D、would stop

答案B

解析 虚拟语气。if引导的假设性条件状语从句,表达与现在事实相反的假设情况时,从句动词结构使用过去式,主句动词使用would+V原形。
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