单项选择题

Before the age of the Internet, we used to（）our holidays through travel agents.

A．book
B．having booked
C．booking
D．have booked

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单项选择题
Now the air pollution in this city（）more and more serious with each passing day.

A．to become
B．became
C．becoming
D．is becoming
单项选择题
The manager said that there were two reasons（）our sales dropped sharply last year.

A．because
B．since
C．why
D．while
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