Only when _____ how important it was to master English. A.did i work i realized B.I worked did IB.I worked did I realize C.did I work did I realize D.I work I realized

Only when _____ how important it was to master English. A.did i work i realized B.I worked did IB.I worked did I realize C.did I work did I realize D.I work I realized
Only when _____ how important it was to master English. A.did i work i realized B.I worked did I
B.I worked did I realize C.did I work did I realize D.I work I realized

Only when _____ how important it was to master English. A.did i work i realized B.I worked did IB.I worked did I realize C.did I work did I realize D.I work I realized
答案：B .I worked did I realize
解析：Only + 状语【副词、介词短语或状语从句】位于句首时,主句要用倒装语序【将助动词前提放在主语之前】.如果是“Only + 状语从句”位于句首,主句倒装,从句不到装【你所给试题即属于此类型】
如：1）Only after a bitter struggle was the aim achieved.这个目的只有经过艰苦的斗争才能达到.【only+介词短语】
2）Only so can aggression be checked.只有这样才能阻止侵略.
注意：若Only 位于主语前则不到装.
如：Only Parker can be a match for me them.跟他们较量的人只有帕克.

B.
only引导状语（包括副词，介词短语，状语从句）放在句首时，主句要部分倒装。
when引导的是时间状语从句，不用倒装。
后面的主句应该用部分倒装。
希望能帮到你！

. A.did i work i realized

A. Only when I worked + did I realize how....
Only 修饰时间状语从句：whenI worked, 引起后面的主句的部分倒装：...did I realize how...
如果把 Only when- 挪到句子后面，就很普通常见了，不倒装了，但语气不如倒装强烈：
I realized how...English ...

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A. Only when I worked + did I realize how....
Only 修饰时间状语从句：whenI worked, 引起后面的主句的部分倒装：...did I realize how...
如果把 Only when- 挪到句子后面，就很普通常见了，不倒装了，但语气不如倒装强烈：
I realized how...English only when I worked.

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