While listening to the concert, the audience is required to remain and keep quiet.
A. seated
B. to be seated
C. seating
D. to seat
网友回答
(答案→)A. seated
B. to be seated
C. seating
D. to seat
解析：考查形容词用法。形容词seated就坐；remain后面接形容词，seat是动词，意为：使…就坐；能容纳…；句意：在听音乐会的时候，观众本要求就坐在自己的位置上，保持安静。故A正确。