They _ make a decision about the election at the meeting.
题目
They _ make a decision about the election at the meeting.
A.didn't need
B.needed not
C.hadn't to
D.didn't have to
答案
D他们不需要在会议上作出选择
如果选need需要在后面加to
A后面须加to才对,B需要把needed中的ed去掉 C的形式不对
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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