选什么?为什么?
题目
选什么?为什么?
He ____ the office when his mother called him up.
A.will leave
B.would leave
C.was about to leave
D.is about to leave
答案
He __C__ the office when his mother called him up.A.will leaveB.would leaveC.was about to leaveD.is about to leave从句是过去时态,主句也要用相应的过去时态他刚要离开办公室,他妈妈打电话来了希望能够帮到楼...
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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