This field of scientific research remains________


  1. A.
    to be untouching
  2. B.
    being touched
  3. C.
    to be untouched
  4. D.
    untouched
D
試題分析：考查remain的用法：remain是“保持, 逗留, 剩余, 殘存”是個(gè)不及物動(dòng)詞，所以可以不接賓語，也可以做連系動(dòng)詞后面接表語，這里是接不定式表示“仍然要做…”，因?yàn)閟cientific research和touch表示被動(dòng)，用不定式的被動(dòng)，選D。
考點(diǎn)：考查remian的用法
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