单项选择题

The water level of an ocean rises ______.

A．when the moon is directly over the water
B．when the moon disappears over the horizon
C．when there is no tide
D．when there is a low tide

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单项选择题

I'll go with you after I get through with ______ the house.

A．cleaning
B．to be cleaned
C．to cleaning
D．having cleaned

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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