on his arrival at school ,he visited his former teacher.为什么用his arriving是错误的

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• on his arrival at school ,he visited his former teacher.为什么用his arriving是错误的请详细说明
• 提一些英语问题It's twenty years he came to work in this school.A.that B.since 答案是B,为什没不选A?Stephen Hawking stressed to the interviews that his accomplishments would certainty have been achieved by others, A.never had he lived B.had he never lived C.he had never lived D.never had he lived为什么选B?这句话又如何翻译?Little i known when i took the trip where it could lead me.为什么用did不用had?He did not teach himself to paint he was in his twenties.这是一道填词题,我写的是before,答案是until ,不
• on his arrival at school ,he visited his former teacher.为什么用his arriving是错误的
• 英语翻译
• 已知椭圆C的中心为直角坐标系xOy的原点，焦点在x轴上，它的一个顶点到两个焦点的距离分别是7和1． （1）求椭圆C的方程； （2）若P为椭圆C上的动点，M为过P且垂直于x轴的直线上的点，|OP||