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
Please speak louder __________ we can hear more clearly.
A． so that
B． since
C． when
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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