We were very tired and___to stop___.A.had,had a rest B.have,have a rest C.had,to have a rest
题目
We were very tired and___to stop___.A.had,had a rest B.have,have a rest C.had,to have a rest
D.has,to have a rest
答案
C,因为前边是and,所以时态一样,肯定选择had,其次是停下来去做某事,应该用to stop to do sth.
to stop doing sth.一般是指停止做某事,这就是stop 的两种常用用法.
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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