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
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单项选择题
William never lends himself to ______ at cards.
A．gambling
B．gamble
C．having gambled
D．have gambled
单项选择题
It is better to die on one's feet than ______ .
A．living on one's knees
B．to live on one's knees
C．lived on one's knees
D．live on one's knees
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