单项选择题

It took me two hours to figure out how to do it.

A．guess
B．sum up
C．understand
D．summarize
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单项选择题
Mr. Bill has never been to China. As a result he knows little about this country.
A．Because
B．Though
C．Consequently
D．Why
单项选择题
Can you lend me some dollars I just lack cash.
A．short
B．need
C．waste
D．arrange
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