单项选择题

______ being May 1 st, many people go out for a holiday.

[A] That
[B] It
[C] It is
[D] This

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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

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

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