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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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

单项选择题

There is no person ______ is always in the right.

[A] who
[B] that
[C] which
[D] whom

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