题目内容
19．It's necessary _______us_______ wear suitable clothes on every occasion．（ ）| A． | for； to | B． | for； for | C． | to； to |
分析 在不同的场合穿合适的衣服是很有必要的．
解答 答案：A，考察常用介词短语辨析．本题主要考查固定句型It is+adj for sb to do sth，在这里it是形式主语，真正主语是动词不定式，根据句意"在不同情况下穿合适的衣服很有必要"，所以选择A．
点评 考察常用介词辨析，应根据题目给定信息，在了解题目大意的条件下，分析固定句式与短语的固定搭配，从而确定答案．
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