单项选择题

If he ______ on tourists for his business, he would have to close his shop.

A．depends
B．will depend
C．depended
D．has depended
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单项选择题
The old lady ______ and fell from the top of the stairs to the bottom.
A．slided
B．slipped
C．split
D．spilled
单项选择题
There is ______ evidence to show that other factors contribute to soil formation.
A．acute
B．agreeable
C．ample
D．attendant
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