单项选择题

It is common practice ______ a battery when it still has some life in it.

A.to charge
B.charge
C.charged
D.having charged
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单项选择题
We understand you need easy access ______ up-to-date information about your accounts in our bank.
A.in
B.to
C.for
D.with
单项选择题
Now the pollution caused by the increasing number of cars ______ more and more serious in many cities.

A.become
B.became
C.is becoming
D.had become
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