单项选择题

AIDS is said ______ the biggest health challenge to both men and women in that area over the past few years.
   A.that it is   B.to be C.that it has been   D.to have been

A.
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Start out right away, ______ you’ll miss the first train. A.and B.but C.or D.while
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-Why didn’t you tell him about the meeting? -He rushed out of the room _____ I could say a worD. A.before B.until C.when D.after
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