You （）him so closely; you should have kept your distance. 选项 A:shouldn.t follow B:mustn.t follow C:couldn.t have been following D:shouldn.t have been following

You （）him so closely; you should have kept your distance.
选项
A:shouldn.t follow
B:mustn.t follow
C:couldn.t have been following
D:shouldn.t have been following

出自：英语语法

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