－Have the police caught the thieves____the bank last week?
题目
－Have the police caught the thieves____the bank last week?
－Yes,they were caught yesterday.应该选什么A.that robbed,B.which robbed C.who have robbed .为什么?
答案
A.that robbed
先行词是人作主语可以用who和that,时间状语是last week说明是一般过去时.
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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