题目内容
Not until you failed completely in the end ________ how stubborn you are．
[ ]
A．
did you know
B．
you knew
C．
you did know
D．
didn’t you know
答案：A
解析：
解析：
|
英语中否定词在句首时句子的主语和谓语通常要部分倒装。 |
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