单项选择题

The experiment requires more money than_______.

A．have been put in
B．being put in
C．has been put in
D．to be put in
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单项选择题
This is an illness that can result in total blindness_______left untreated.
A．after
B．if
C．since
D．unless
单项选择题
Because Edgar was convinced of the accuracy of this fact, he ______his opinion.
A．struck at
B．strove for
C．stuck to
D．stood for
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