单项选择题

There is no easy solution to Japan's labor ______.

A．decline
B．shortage
C．rarity
D．vacancy
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单项选择题
You haven't wasted my time; on the ______, you've helped me save some time.
A．contrary
B．reverse
C．opposite
D．contrast
单项选择题
Peter is a young man of independent thinking who is not about ______ compliments to his political leaders.
A．paying
B．having paid
C．to pay
D．to have paid
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