My wallet is nowhere to be found.I ( )when I was on the bus
题目
My wallet is nowhere to be found.I ( )when I was on the bus
A.must drop it B.should have dropoed it C.must have dropped it D.had dropped it
答案
答案选C.must have dropped it
本句意为:我的钱包到处都找不到.肯定是在车上的时候,我把它弄掉了.
对过去情况的肯定推测,用must have done,所以选C.
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
最新试题
热门考点