This field of scientific research remains________.
A．to be untouchingB．being touched
C．to be untouchedD．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。
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