Question

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

Answer 1

A

【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。