If Tom ____(study)harder before,he____(pass)the examination last week.
题目
If Tom ____(study)harder before,he____(pass)the examination last week.
答案
had studied; would have passed
考察虚拟语气,与过去事实相反,从句谓语用had+过去分词；主句谓语用would/should/could/might + have + 过去分词
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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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