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5.-Always look around_________ you cross the street,David.
-OK.I know,Mom.(  )
A.untilB.beforeC.unless

分析 --David,过马路前先看看四周.
--好的,我知道,妈妈.

解答 答案:B.
首先明确选项中每个单词或短语的意思,A:直到;B:在…之前;C:除非; 根据题干结合you cross the street推测设空处句子的句意是"David,过马路前先看看四周.",由此判断句子中缺少"before"一词,故答案为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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