单项选择题

A) watched C) has been watching
B) had been watching D) had watched

A．watched
B．had been watching
C．has been watching
D．had watched
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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
单项选择题
A) to C) for B) with D) by
A．to
B．with
C．for
D．by
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