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题目内容
（英语语法）
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
选项
A:shouldn.t follow
B:mustn.t follow
C:couldn.t have been following
D:shouldn.t have been following
参考答案
