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(chǎng)不如以前干凈整潔，必須阻止學(xué)生亂丟雜物。Stop to do sth停下來(lái)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(jié)合句意必須阻止學(xué)生亂丟雜物，而學(xué)生students作句子主語(yǔ)，故用被動(dòng)語(yǔ)態(tài)。所以選B。
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