单项选择题

The Chinese government is determined to go ______ the established policy of developing agriculture.

A．after
B．on
C．ahead
D．by
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单项选择题
By the year 2010, scientists probably ______ an effective treatment for cancer.
A．will have discovered
B．are discovering
C．will be discovering
D．have discovered
单项选择题
William never lends himself to ______ at cards.
A．gambling
B．gamble
C．having gambled
D．have gambled
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