问题
选择题
Waste paper _______ everywhere. It's our duty to keep the school clean. [ ]
A. throws
B. are thrown
C. shouldn't be thrown
D. should be thrown
答案
答案：C
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Waste paper _______ everywhere. It's our duty to keep the school clean. [ ]
A. throws
B. are thrown
C. shouldn't be thrown
D. should be thrown
答案：C