单项选择题

In fact, she had done all ______ to help the poor.

A．that she could
B．which she could
C．what she could
D．as she could
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单项选择题
There is no easy solution to Japan's labor ______.
A．decline
B．shortage
C．rarity
D．vacancy
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
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