单项选择题

A) fastened C) had fastened
B) were fastening D) would fasten

A．fastened
B．were fastening
C．had fastened
D．would fasten
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单项选择题
A) to C) for B) with D) by
A．to
B．with
C．for
D．by
单项选择题
A) that C) when B) so D) then
A．that
B．so
C．when
D．then
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