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        1. Our playground is not so tidy and beautiful as before, students must ____ dirty things on it.  
          A.be stopped to throwB.be stopped throwing
          C.stop to throwD.stop from throwing
          B

          試題分析:句意:我們的操場不如以前干凈整潔,必須阻止學生亂丟雜物。Stop to do sth停下來去做某事;stop doing sth停止做某事;stop sb from doing sth阻止某人做某事。結合句意必須阻止學生亂丟雜物,而學生students作句子主語,故用被動語態(tài)。所以選B。
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