53. We _D_ our breakfast when an old man came to the door.
题目
53. We _D_ our breakfast when an old man came to the door.
A just have had B have just had C just had D had just had
为什么不选B?
答案
D对
因为主句的动作发生在从句之前,从句的时态是一般过去时,故从句要用过去完成时‘表示过去的过去已经发生或完成了的动作.
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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