单项选择题

He couldn't have meant it ________ He must have been pulling your leg.

A．seriously
B．repeatedly
C．properly
D．jolly
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单项选择题
I think we need to see an investment, ________ before we make an expensive mistake.
A．guide
B．entrepreneur
C．engagement
D．assessor
单项选择题
There is supposed to be a safety ________ which makes it impossible for trains to collide.
A．appliance
B．accessory
C．machine
D．mechanism
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