单项选择题

I was unaware of the critical points involved, so my choice was quite ________.

A．arbitrary
B．deliberate
C．mechanical
D．unpredictable
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单项选择题
If you keep on taking on more work than you can do, your health will ________.
A．degrade,
B．degenerate
C．exhaust
D．deteriorate
单项选择题
They were in a _________ position, with the enemy on the hill above them.
A．voluntary
B．vulnerable
C．vulgar
D．violet
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