问题补充:
Waste paper shouldn’t everywhere. It’s our duty to keep our classroom clean.
A. be thrown B. throw C. is thrown
答案:
解析: 本题的含义是不应该到此乱扔废纸,should为情态动词后加动词原形,本题前半句表示被动的意思,结构为be+过去分词,故本题选A。
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