单项选择题

What causes tide

A．The pull of the sun and the moon.
B．The heat of the sun.
C．The shape of the moon.
D．The light of the moon.
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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
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
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