单项选择题

The detective watched and saw the suspect ______ a hotel at the comer of the street.

A．getting off tile taxi and walking into
B．got off the taxi and walked into
C．get off the taxi and walk into
D．got off the taxi to walk into
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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
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
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