单项选择题


A．countless
B．titanic
C．broad
D．vast
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单项选择题
A．to payB．payingC．payD．to have paid
A．to pay
B．paying
C．pay
D．to have paid
单项选择题
A．is beingB．areC．have beenD．is
A．is being
B．are
C．have been
D．is
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