20.It's very wise of you to            well trained workers            untrained ones in the assembly line(流水線).(  )
A.substitute; forB.substitute; with
C.replace; byD.replace; with

分析 在流水線上用訓(xùn)練有素的工人代替未經(jīng)過訓(xùn)練的工人,你太明智了.

解答 答案是A.本題考查動詞短語中的介詞搭配.substitute和replace都可以表示"替換";substitute A for B 表示"用A代替B";replace A with/by B 用B替換A (使用B);根據(jù)句意和常識判斷是"用受過訓(xùn)練的工人代替未受培訓(xùn)的工人",所以答案選擇A.

點評 介詞辨析要在掌握各介詞的基本用法和固定搭配的基礎(chǔ)上結(jié)合語境做出符合邏輯、常理的推測.

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