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Computers are used        workers        helping make many dinfferent things now.

A.to, forB.by, forC.by, toD.for, to

B

解析试题分析:to,到,给;by通过,被,依据;for为了,代表;句意:现在电脑被工人们用来制作许多不同的东西。故选B。
考点:介词辨析
点评:英语介词的一个特点是一词多义,并且介词间语义交叉现象很多,习惯用法也很多。故学习中要注意不断总结,结合语境结合基本词义多记一些介词的习惯用法。

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