Darkness __________, the young people lingered on merrymaking.

Darkness __________, the young people lingered on merrymaking.
A、sets in
B、setting in
C、set in
D、had set in
【正确答案】：B
【题目解析】：由于一个句子中只能有一个谓语动词，故此空要用非谓语动词。darkness与set之间是主动关系，所以要用ing形式。