单项选择题

The king was totally unaware that his reign was at ______ .

[A] danger
[B] question
[C] stake
[D] hazard
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单项选择题
The Martian surface temperature is 100 degrees below zero at night, so that butter put outside will not ______ .
[A] thaw
[B] dissolve
[C] melt
[D] fuse
单项选择题
Nowhere in nature is aluminum found free, owing to its always ______ with other elements, most commonly with oxygen.
[A] being combined
[B] having combined
[C] to combine
[D] combined
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