单项选择题

Nowhere in nature is aluminum found free, owing to it always ______ with other elements, most commonly with oxygen.

[A] being combined
[B] having combined
[C] to combine
[D] combined
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单项选择题
The experts ______ on the cause of poverty but agree on steps to eradicate it.
[A] differ
[B] distinguish
[C] dissent
[D] object
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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