单项选择题

He didn't come yesterday. He busy working in the lab.

[A] must be
[B] would have been
[C] must have been
[D] would be

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单项选择题

All the flights ______because of the extremely heavy rain, we had to postpone our schedule.

[A] were canceled
[B] had been canceled
[C] having canceled
[D] having been canceled

单项选择题

We're waiting for the director to give his______.

[A] accent
[B] ascent
[C] descent
[D] assent

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