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

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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

单项选择题

If the task ______ by the end of this year is delayed, the company will be under punishment.

[A] being completed
[B] is completed
[C] to be completed
[D] completed

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