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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The house built of stone lasts longer than______built of wood.
A. the one
B. one
C. that
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I’ll never forget______you for the first time.
A. to meet

B. meeting
C. to have met

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