That evening he what he had thought about the research.A. set about ; set downB. set abou

问题补充：

That evening he what he had thought about the research.

A. set about ; set down

B. set about; to set down

C. set out ; setting down

D. set out; to set down

答案：

A. set about ; set down

B. set about; to set down

C. set out ; setting down

(答案→)D. set out; to set down

解析：本题考查set短语辨析。句意：那天晚上他着手记下他想到的关于实验的东西。

set about doing sth=set out to do sth着手做某事。