单项选择题

We couldn't use the vending machine because it ().

A.was being repaired
B.had been repaired
C.was repairing
D.was repaired

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单项选择题
Many incurable diseases such as cancer and prostatitis become commoner () we get older.

A.if
B.as
C.for
D.before
单项选择题
() those bad habits, he would not have got liver cancer.

A.Was he giving up
B.Did he give up
C.If he gave up
D.Had he given up
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