单项选择题

My task boils down to industrial ______ and trouble shooting.

A．contact
B．intimacy
C．liaison
D．involvement
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单项选择题
Had it not been for your timely help, our company would have been on the verge of ______.
A．failure
B．bankruptcy
C．success
D．wealth
单项选择题
The aurora is one of nature's most ______ spectacles.
A．troublesome
B．tiresome
C．awesome
D．wearisome
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