The teacher always waits until all the children before he starts the lesson.
A. get down
B. set down
C. put down
D. settle down
网友回答
A. get down
B. set down
C. put down
(答案→)D. settle down
解析：考察动词短语辨析。A写下；B制定，写下；C写下，记下；D定居，安定，使…安定下来；句意：这位老师总是等到所有的孩子都安静下来才开始上课。根据句意说明D正确。