单项选择题

A) would C) used to
B) could D) was used to

A．would
B．could
C．used to
D．was used to
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单项选择题
A) show C) untieB) loosen D) open
A．show
B．loosen
C．untie
D．open
单项选择题
A) after C) duringB) for D) in
A．after
B．for
C．during
D．in
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