单项选择题

Since the new technology was introduced last month, we（）in speeding up production.

A．succeed
B．succeeded
C．have succeeded
D．will succeed

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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
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
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