While listening carefully the students what their teacher said.A. set downB. turned down

问题补充：

While listening carefully, the students what their teacher said.

A. set down

B. turned down

C. got down

D. calmed down

答案：

(答案→)A. set down

B. turned down

C. got down

D. calmed down

解析：考查动词短语的区别。A 写下，记下； B 拒绝； C 认真； D 平静；根据句意：当学生们仔细听老师讲时，他们把老师所说的记下来。故A正确。