should/shouldn't建议表达 — 英语词汇题
题目
City Clean Week 在进行中，同学们写下环保建议。请选出正确的一项：Our city is dirty. We ______ throw rubbish in the river, and we ______ put it in the bin. A. shouldn't; should B. should; shouldn't C. shouldn't; shouldn't D. should; should