单项选择题

A．In
B．For
C．At
D．To
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单项选择题
A．ledB．guidedC．followedD．pushed
A．led
B．guided
C．followed
D．pushed
单项选择题
A．fastenedB．had fastenedC．were fasteningD．would fasten
A．fastened
B．had fastened
C．were fastening
D．would fasten
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