单项选择题

The experiment shows that proper amounts of exercise, if () regularly, can improve our health.

A. being carried out
B. carrying out
C. carried out
D. to carry out

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单项选择题

By nine o’clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, () appeared a rare rainbow soon.

A. of which
B. on which
C. from which
D. above which

单项选择题

Because of the heavy traffic, it was already time for lunch break () she got to her office.

A. since
B. that
C. when
D. until

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