题目内容

Only when he returned______ the truth.

A．he found outB．did he find outC．he finds outD．does he find out

B

解析试题分析：考查only的倒装句。当only放在句首，且强调的是状语的时候，使用部分倒装句式。本题的only放在句首，强调的是时间状语从句when he returned,主句使用部分倒装形式。句意：只有当他回来的时候，他才发现真相。故B正确。D项错在时态。
考点：考查only的倒装句
点评：only的倒装有两个条件，当only放在句首，且强调的是状语的时候，使用部分倒装句式。

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