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
-- ________ this week-- No, he's on holiday.
A．Does Colin work
B．Is Colin working
C．Will Colin work
单项选择题
Please speak louder ________ we can hear more clearly.
A．so that
B．since
C．when
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