20．You should always dress on a businesslike way，even if others dress casually．on 改成in．

分析 你應(yīng)該總是穿得有條理，即使別人穿著隨便．

解答 on 改成in 考查介詞．be dressed in 是英語的固定搭配．表示穿著的狀態(tài)．所以答案改成in．

點評 介詞是虛詞，主要用來表示人、物、事件等與其他人、物、事件之間的關(guān)系，如空間位置、時間先后、因果關(guān)系、方式方法等． 解答這類題目首先要認真掌握好常用介詞的主要用法及動詞與介詞的搭配．這是考查的重點，也是做題的基礎(chǔ)．  其次在具體的題目中，要首先判斷考查方式，判斷后才能做具體分析．

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