This field of scientific research remains .
A. to be untouching
B. being touched
C. to be untouched
D. untouched
网友回答
A. to be untouching
B. being touched
C. to be untouched
(答案→)D. untouched
解析:考查remain的用法:remain是“保持, 逗留, 剩余, 残存”是个不及物动词,所以可以不接宾语,也可以做连系动词后面接表语,这里是接不定式表示“仍然要做…”,因为scientific research和touch表示被动,用不定式的被动,选D。