Einstein’s theory of relativity seemed hard to believe at the time _
题目
Einstein’s theory of relativity seemed hard to believe at the time _
A.when he first introduced B.that he first introduced it C.he first introduced D.which he first introduced it
答案
A,C 缺宾语,introduce 是及物动词,得有宾语
D at which 就对了,单个which 不能做时间状语
B 中的that 等于when= at which,在定语从句中作时间状语
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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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