英语语法:You____himsoclosely;youshouldhavekeptyourdistance.A.shouldn'tfollowB.mustn'tfollowC.couldn'thavebeenfollowingD.shouldn'thavebeenfollowing请问ABC错在哪?
英语语法:You____himsoclosely;youshouldhavekeptyourdistance.
A.shouldn'tfollow
B.mustn'tfollow
C.couldn'thavebeenfollowing
D.shouldn'thavebeenfollowing
请问ABC错在哪?