Question

--- Look, the factory is pouring waste water into the river.

--- That’s terrible! Why not _____ them _____ that?

A. keep; doing

B.to keep; to do

C.stop; doing

Answer 1

C

【解析】

试题分析：句意：-看，这个工厂在向河中排污水。-那真是糟糕，为什么不阻止他们那么做？why not do sth,为什么不做某事，提出建议。stop sb doing sth,阻止某人做某事。根据结构，故选C。

考点：考查非谓语动词的用法。