问题
选择题
Waste paper shouldn't ______ everywhere. It's our duty to keep our classroom clean. [ ]
A. be thrown
B. throw
C. is thrown
D. are thrown
答案
答案：A
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Waste paper shouldn't ______ everywhere. It's our duty to keep our classroom clean. [ ]
A. be thrown
B. throw
C. is thrown
D. are thrown
答案：A