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 food you bought yesterday______.
A．is tasted good
B．is tasted well
C．tastes good
D．tastes well
单项选择题
______their service, many taxi drivers in Shanghai are going to learn everyday English.
A．Improving
B．Having improved
C．Improved
D．To improve
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