单项选择题

A．to close
B．closing
C．to have to close
D．for closing
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单项选择题
A．to shutB．for shuttingC．in shuttingD．but shut
A．to shut
B．for shutting
C．in shutting
D．but shut
单项选择题
A．had to jumpB．was to have jumpedC．must have jumpedD．could be jumped
A．had to jump
B．was to have jumped
C．must have jumped
D．could be jumped
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