单项选择题

We have low tide ______.

A．when water reaches its highest level
B．when water stops
C．when water no longer moves
D．when water reaches its lowest level
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单项选择题
Shining down out of the blue sky, ______.
A．their pale skins were burnt by the sun
B．they were burnt by the fierce sun
C．the sun burnt their tender skins
D．the sun burning their pale skins
单项选择题
To do well in sports, ______.
A．a training course must be followed
B．you must follow a training course
C．there is a training course to follow
D．a schedule for training must be followed
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