单项选择题

His compass proved __________ to him when he was lost unknown country.

A．valuable
B．expensive
C．precious
D．costly
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单项选择题
It was difficult to guess what her __________ to the news would be.
A．impression
B．reaction
C．common
D．opinion
单项选择题
Yes, Mr. Jones. I realized that you are anxious for promotion, but are you prepared to __________ the extra responsibility
A．take on
B．take up
C．set about
D．go about
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