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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