Great!Your English is very excellent.Do you learn it here? No.I__as an exchange student in America
题目
Great!Your English is very excellent.Do you learn it here? No.I__as an exchange student in America
for 2 years.
A、had studied B、were studing C、have studied D、studied
请详解一下,重点解释ACD三个选项
答案是D
答案
已不在当年做交换生这个情境,所以无需完成时,用过去式即可.而且A中没有过去式这一层直接跳到过去完成时显然不对.
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.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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