______the exam,the boy was punished by his father.
题目
______the exam,the boy was punished by his father.
A.No passing B.Having passed
C.Not passing D.Not having passed
答案应该选D,为什么不能选C?
答案
强调这两个动作的发生顺序,由于考试没过,他爸爸才惩罚了他,考试没过这个动作先发生,用完成时体现
举一反三
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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