问题补充：
The police asked him to what he had seen in a report.
A. set in.
B. set out.
C. set off..
D. set down
答案：
A. set in.
B. set out.
C. set off..
(答案→)D. set down
解析：考查词组：句意：警察让他在报告中记下他所看到的。A. set in.嵌入，B. set out.出发，动身，开始，C. set off.引发，引爆，出发，D. set down记下，写下，选D。
