– I’m very tired.– We really should stop .A. to walkB. walkC. walkingD. walked

问题补充：

– I’m very tired.

– We really should stop .

A. to walk

B. walk

C. walking

D. walked

答案：

A. to walk

B. walk

(答案→)C. walking

D. walked

解析：考查固定词组。Stop有两个词组，stop to do sth停下来做另外一件事情；stop doing sth停止做某事；句意：—我很累。—我们真地应该停止走路了。根据句意说明C正确。