单项选择题

We have produced twice as much steel this year（）4 years ago.

A．than we did
B．as did
C．than we have produced
D．as we have produced

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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
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
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