The airport got crowded this morning .The plane___late because of the bad weather.A,had taken off
题目
The airport got crowded this morning .The plane___late because of the bad weather.A,had taken off
B,was taken off C.had been taken off D,took off 请说明理由.
答案
D took off 起飞不用被动 所以排除BC选项 这句话也没有完成时的标志 用一般过去式即可
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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