单项选择题

The old couple have been married for 40 years and never once ______ with each other.

A．they had quarreled
B．they have quarreled
C．have they quarreled
D．had they quarreled
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单项选择题
The weather today is ______ it was yesterday.
A．not as hotter as
B．as hotter
C．as hot as
D．not as hot than
单项选择题
A cook will be immediately fired if he is found ______ in the kitchen.
A．smoke
B．smoking
C．to smoke
D．smoked
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