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9.To keep safe,drivers aren't supposed to drink before driving.(  )
A.aren't willing toB.shouldn't
C.aren't sure toD.don't have to

分析 为了保持安全,司机不应该在开车前喝酒.

解答 答案:B.
首先明确选项中各个短语的意思,A:不愿意;B:不应该;C:不确定;D:不必; 根据语境To keep safe,drivers aren't supposed to drink before driving可知句意是"为了保持安全,司机不应该在开车前喝酒",由此判断原句中的短语aren't supposed to 相当于shouldn't,故选B.

点评 了解每个选项的含义是做好此类题型的关键,还要从句意着手,根据句意作出解答;所以,平时的学习中要多进行积累词汇,才能很好的完成.

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