单项选择题

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

A．should n' t follow
B．must n' t follow
C．could n' t have been following
D．should n' t have been following
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单项选择题
One of the examination questions ______ me completely and I could n' t answer it.
A．baffled
B．mingled
C．provoked
D．diverted
单项选择题
Creating so much confusion, Mason realized he had better make ______ what he was trying to toll the audience.
A．exclusive
B．explicit
C．objective
D．obscure
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