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— May I speak to your manager Mr. Williams at five o,clock tonight —“I'm sorry. Mr. Williams （） to a conference long before then.

A．will have gone
B．had gone
C．would have gone
D．has gone

单项选择题In order to show his boss what a careful worker he was, he took ___________ trouble over the figures.