情态动词should提出环保建议 — 英语选择题
题目
校园环保周到了，Lily 想给同学们提建议。下列哪一句正确使用了情态动词 should 提出环保建议？
A. We should saves water when we wash hands.
B. You should not throw rubbish into the river.
C. He should to turn off the lights.
D. They shouldn't to waste paper.