Only when she had accomplished the task______that she had made a mistake.
A、
did she realize
B、
she then realized
C、
she realized
D、
before she realize
【正确答案】
A
【答案解析】
“only+状语”位于句首表示强调时，句子应部分倒装，即把助动词、系动词或情态动词提至主语之前。选项B、C、D为正常语序，不合题意。故选A。
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