Earth is believed ______ by an object the size of Mars at some point in the distant past
before its surface cooled.
A.to be hit | B.to have hit | C.to have been hit | D.to hit |
相关知识点
推荐套卷
Earth is believed ______ by an object the size of Mars at some point in the distant past
before its surface cooled.
A.to be hit | B.to have hit | C.to have been hit | D.to hit |