单项选择题

I would have gone to the lecture with you ______ I was so busy.

A．except that
B．provided that
C．but that
D．only that
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单项选择题
Hydrocarbons, ______ by engine exhausts, react with nitrogen oxides in the presence of sunlight to form complex toxic gases.
A．are given off
B．give off
C．they are given off
D．given off
单项选择题
People suffering from ______ prefer to stay shut in their homes and become panic-stricken in large public buildings and open fields.
A．acrophobia
B．agoraphobia
C．claustrophobia
D．xenophobia
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