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1.It is careless         him to lose his wallet again.I think it necessary       him to be more careful next time.(  )
A.of; toB.of; forC.for; forD.for; to

分析 他太粗心了,再次丢了钱包.我认为下次他有必要更小心.

解答 答案:B
这是句型"it's+adj+for/of+sb.+to do sth"中,如果形容词是描写不定式行为者的性格或品质的,用介词of;如果仅仅是描述事物则用for.第一空前面的careless描述人的性格,第二空前面的necessary描述动作行为本身.故选B.

点评 本题考查介词的辨析,介词的用法一般都是固定的.熟记介词的用法及结合语境是解答本题的关键.

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