Jane studies chemistry ________ asking the teacher ________ help.

A．for; by B．for; to C．by; by D．by; for

【答案】

【解析】

試題分析：by+doing sth通過做某事，固定結構；ask sb for help固定短語，句意：簡通過向老師尋求幫助來學習化學。故選D.

考點：介詞

點評：介詞是中考必考點，需要認真掌握。介詞在英語中起到穿針引線的作用，英語介詞的一個特點是一詞多義，并且介詞間語義交叉現象很多，習慣用法也很多，有時很難從詞義上區分開來。故學習中要注意不斷總結，結合語境結合基本詞義多記一些介詞的習慣用法和固定搭配。

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