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