单项选择题

______come out of the building, my first thought was to call the fire department.

A．On seeing the smoke
B．When I saw the smoke
C．Having seen the smoke
D．As soon as the smoke was seen
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单项选择题
He chainsmokes like a chimney ______, he has developed a constant cough.
A．out of the question
B．out of question
C．small wonder
D．out of order
单项选择题
You ______ your own sandwiches. I have enough for two.
A．couldn't have brought
B．mustn't have brought
C．shouldn' t have brought
D．needn' t have brought
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