单项选择题

In order to improve your communication skills, we will show you how to learn ______ about your customers than you know now.

A．many
B．much
C．most
D．more
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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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