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
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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
单项选择题
By signing the lease we made a ________ to pay a rent of $150 a week.
A．conception
B．commission
C．commitment
D．confinement
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