-What courses are you going to take next semester if you want to receive enough credits to get your
题目
-What courses are you going to take next semester if you want to receive enough credits to get your degree?
-I don't know.But it's about time____on something.
A.I'd decide B.I decided C.I decide D.I'm deciding
答案
B
1 it's (about/high)time for sb to do sth
2 it's (about/high)time sb did sth 这里从句里的谓语动词用过去时.
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．
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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