单项选择题

______they can get people in the organization to do what must be done, they will not succeed.

A．Since
B．Unless
C．If
D．Whether
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单项选择题
These two chemicals______with each other at a certain temperature to produce a substance which could cause an explosion.

A．interact
B．attract
C．react
D．expel
单项选择题
Once you have started a job, you should do it______.
A．in practice
B．in theory
C．in earnest
D．in a hurry
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