Only after he realized the significance of mastering two languages ______ English carefully.
A．did he set about learningB．did he set out learning
C．had he set about learningD．had he set out learning
A

試題分析：考查部分倒裝句和詞組：句意：只有在他意識到掌握兩門外語的重要性后，他才開始認真學習英語。only+副詞/介詞短語/狀語從句，放在句首時，主句用部分倒裝，be動詞，情態(tài)動詞，助動詞放在主語前面，realize和set out是同時發(fā)生，所以用過去時，排除CD項，而且set about doing是開始做什么，set out后面接不定式做賓語。選A。
點評：Only放在句首，強調(diào)狀語的時候，后面使用倒裝句的語序。但注意如果only后面接的是主語或賓語，就不用倒裝句。這題還涉及到時態(tài)和詞組辨析。
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