单项选择题

The best solution to the problem can only be found by a process of trail and ______.

A．mistake
B．error
C．success
D．experiment
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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
单项选择题
______ to speak when the audience interrupted him.
A．Hardly did he begin
B．No sooner had he begun
C．Not until be begun
D．Scarcely had he begun
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