C
因为不知道是谁,所以用it
Who is knocking at the door?---_____ may be Mary.A.She B.He C.It D.This
Who is knocking at the door?---_____ may be Mary.A.She B.He C.It D.This
为什么不是A呢？主语是Mary啊
为什么不是A呢？主语是Mary啊
英语人气：138 ℃时间：2019-08-20 13:47:14
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