Computers are used        workers        helping make many dinfferent things now.


  1. A.
    to, for
  2. B.
    by, for
  3. C.
    by, to
  4. D.
    for, to
B
試題分析：to，到，給；by通過，被，依據(jù)；for為了，代表；句意：現(xiàn)在電腦被工人們用來制作許多不同的東西。故選B。
考點：介詞辨析
點評：英語介詞的一個特點是一詞多義，并且介詞間語義交叉現(xiàn)象很多，習(xí)慣用法也很多。故學(xué)習(xí)中要注意不斷總結(jié)，結(jié)合語境結(jié)合基本詞義多記一些介詞的習(xí)慣用法。
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