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The sun rises in the east and sets in the west,so it seems as if the sun__________round the earth.
A.were circlingB.circles
C.is circlingD.be circling
A?
as if引导的从句要求用虚拟语气,动词要用过去时(be动词用were)或would(could等)+动词原形,本句话中指的是当时的情况,所以要用过去式,故A是正确答案。?
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