【題目】The sign warns people ______ litter on the ground.

A. to throw B. not to throw C. throwing D. don’t throw

【答案】B

【解析】

句意：這個牌子警告人們不要把垃圾扔到地上。throw動詞，仍；warn sb. (not) to do sth.警告某人（不）做某事，動詞不定式的否定形式: not to do。故選：B。

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