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引導(dǎo)的從句要求用虛擬語氣，動詞要用過去時（be動詞用were）或would(could等)+動詞原形，本句話中指的是當(dāng)時的情況，所以要用過去式，故A是正確答案。?
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