问题补充：
We should always keep the classroom and tidy.
A. cleaning
B. cleaned
C. to clean
D. clean
答案：
A. cleaning
B. cleaned
C. to clean
(答案→)D. clean
解析：句意：我们应该总是保持教室干净整洁。keep+形容词，使------保持某种状态。结合语境可知选D。
如果觉得《We should always keep the classroom and tidy.A. cleaningB. cleanedC. to cleanD. clean》对你有帮助，请点赞、收藏，并留下你的观点哦！
