单项选择题

It's because he helped you ______ I'm ready to help him.

A．why
B．since
C．so
D．that
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单项选择题
Where could she ______ the key I couldn't find anywhere.
A．put
B．have put
C．has put
D．had put
单项选择题
In that country, the cost of living ______ quickly after the war broke out.
A．raced
B．raised
C．arose
D．rose
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