He had run away ______ I could tell him something about his examination.
题目
He had run away ______ I could tell him something about his examination.
A.before B.until C.since D.when
答案
A.before.从before到最后是一个时间状语从句,译为:在我告诉他关于他的检查前,他就跑了.
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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