单项选择题

Under no circumstances ______ leave his post.

A．a soldier mustn't
B．a solider must
C．mustn't a soldier
D．must a solider
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单项选择题
The experience ______ in the war will be of great value to us.
A．to gain
B．gaining
C．gained
D．gain
单项选择题
______ got in the wheat than it began to rain heavily.
A．No sooner had they
B．No sooner have they
C．No sooner they
D．No sooner they had
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