——A——— no electronic computers,there would have been no artificial satellites or rockets.
题目
——A——— no electronic computers,there would have been no artificial satellites or rockets.
A.Had there been B.If there were
C.should there be D.If there might be
请问为什么会是A,而不是其他的了,又是怎么看句子结构,求详解.
答案
A Had there been这是一个倒装的虚拟语气句子(Had there been) no electronic computers,there would have been no artificial satellites or rockets.要不是电子计算机（的出现）,就不会有人造卫星或火箭....
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
最新试题
热门考点