Question

【题目】—We should sweep the floor every day________ a clean classroom. —You are right.

A. keep B. keeps C. keeping D. to keep

Answer 1

【答案】D

【解析】句意：——我们应该每天扫地以保持教室整洁。——你说得对。动词不定式用作目的状语，故答案为D。