题目内容
10．I bet she's doing this_____purpose•（ ）| A． | in | B． | on | C． | with |
分析 我敢打赌，她是故意这样做的．
解答 答案：B
根据句意和句中出现的介词短语on purpose，意为"故意"，可知on符合句子意思，故选B．
点评 本题考查常用介词的辨析．在熟知词义的基础上，再联系句子所表达的含义，从而选出正确的答案．
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