作业帮listen!I hear someone__the door A.is opening B.open C.opening D.to open
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listen!I hear someone__the door A.is opening B.open C.opening D.to open
listen!I hear someone__the door A.is opening B.open C.opening D.to open
listen!I hear someone__the door A.is opening B.open C.opening D.to open
肯定是C啊 固定用法hear sb do/doing