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

分析 --David,過馬路前先看看四周.
--好的,我知道,媽媽.

解答 答案:B.
首先明確選項中每個單詞或短語的意思,A:直到;B:在…之前;C:除非; 根據(jù)題干結(jié)合you cross the street推測設空處句子的句意是"David,過馬路前先看看四周.",由此判斷句子中缺少"before"一詞,故答案為B.

點評 了解每個選項的含義是做好此類題型的關鍵,還要從句意著手,根據(jù)句意作出解答;所以,平時的學習中要多進行積累詞匯,才能很好的完成.

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