A computer is so useful a machine ______ we can use everywhere.


  1. A.
    that
  2. B.
    which
  3. C.
    as
  4. D.
    what
C
本題考查句子結(jié)構(gòu)和關(guān)系代詞的選用。首先表示認(rèn)清句子結(jié)構(gòu)，use后面應(yīng)該接一個(gè)及物動(dòng)詞，先行詞應(yīng)該充當(dāng)賓語，而前面出現(xiàn)so useful不能用that與which來修飾，可以排除。另外，what 不能引導(dǎo)定語從句。
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D．We can touch the things we see on TV.

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C．The shortage of robots.                   D．The more space planes.

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