单项选择题

You ______. him so closely; you should have kept your distance.

A．shouldn't follow
B．mustn't follow
C．couldn't have been following
D．shouldn't have been following
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单项选择题
The mason ______ I didn't do this exercise is I didn't know how to do it.
A．why...because
B．why...that
C．for...that
D．that...because
单项选择题
When you ______ your meal, we'll go to the movies together.
A．have
B．have had
C．will have had
D．had
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