Not until l began to work _ how much time l had wasted.A.have l realized B.l have realized
题目
Not until l began to work _ how much time l had wasted.A.have l realized B.l have realized
C.did l realize D.l realized
答案
选C not until放在句首时,Until 引导的从句不倒装,后面的主句要部分倒装
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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