Only after he realized the significance of mastering two languages English carefully.A．did he set about learningB．did he set out learningC．had he set about learningD．had he set out learning 题目和参考答案——青夏教育精英家教网—

题目内容

Only after he realized the significance of mastering two languages ______ English carefully.

A．did he set about learning	B．did he set out learning
C．had he set about learning	D．had he set out learning

解析试题分析：考查部分倒装句和词组：句意：只有在他意识到掌握两门外语的重要性后，他才开始认真学习英语。only+副词/介词短语/状语从句，放在句首时，主句用部分倒装，be动词，情态动词，助动词放在主语前面，realize和set out是同时发生，所以用过去时，排除CD项，而且set about doing是开始做什么，set out后面接不定式做宾语。选A。
考点：考查Only的倒装句
点评：Only放在句首，强调状语的时候，后面使用倒装句的语序。但注意如果only后面接的是主语或宾语，就不用倒装句。这题还涉及到时态和词组辨析。

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Not only governments but ordinary people as well must work together to solve the problem. They can choose not to buy those products which require the production of dangerous waste, and produce less harmful waste themselves. Many scientists think that waste production can be cut. The waste can be reduced by at least one third using existing technologies and methods.

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