单项选择题

The research requires more money than ______.

A．have been put in
B．has been put in
C．being put in
D．to be put in
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单项选择题
He would have finished his college education, but he ______ to quit and find a job to support his family.
A．had had
B．has
C．had
D．would have
单项选择题
The student said there were a few points in the essay he ______ impossible to comprehend.
A．had found
B．will arise
C．arose
D．have arisen
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