单项选择题

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

A．artistic
B．artificial
C．arbitrary
D．mechanical
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单项选择题
The ghostly presence was just a(n) ______ sensation of some people.
A．objective
B．subjunctive
C．subjective
D．objected
单项选择题
Experts say the space rock is probably ______ more than $ 30,000.
A．weighty
B．costly
C．valuable
D．worth
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