No one was sure how long the snow _______ (last) at that moment. All they could do was to wait.
题目
No one was sure how long the snow _______ (last) at that moment. All they could do was to wait.
答案
would last 此句是由how long 引导的从句前面用was 是过去式,又由于at that moment为将来时所以用过去将来时态.我的回答希望能帮到忙,
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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