Customers are asked to make sure that they ______ the right change before leaving the shop.
题目
Customers are asked to make sure that they ______ the right change before leaving the shop.
Customers are asked to make sure that they ______ the right change before leaving the shop.
A.will give B.have been given C.have given D.will be given 为什么?顺便再翻译一下.
答案
have been done 是现在完成时.找零发生在离开商店的前面.
顾客被要求在他们确定正确找零后,离开商店.
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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