单项选择题

A heavy stone __________ his foot.

A．fell on
B．knocked down
C．fallen down
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单项选择题
—How soon will you be able to finish your homework
A．After two hours
B．In two hours
C．Two hours later
单项选择题
The foreign friends think __________ the Chinese people are very friendly.
A．that
B．if
C．because
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