单项选择题

The only thing ______ really matters m the parents is how soon their children can return home.

A．what
B．that
C．which
D．this
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单项选择题
Experts say the space rock is probably ______ more than $ 30,000.
A．weighty
B．costly
C．valuable
D．worth
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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