题目

The sun rises in the east and sets in the west, so it seems as if the sun __________ round the earth. A. were circling   B. circles     C. is circles        D. be circling   答案： A   此题考查as if用法。从句表示的是与事实相反的假设或实现的可能性很小的事情时，则从句谓语要用虚拟语气，对现在情况的虚拟用动词过去式，be用were。  

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