【单选题】关于地下水含水层中渗透速度与实际流速之间关系说法正确的是( )。
【单选题】据记载,最早建筑长城的诸侯国是____。
【简答题】Complete the sentences with the appropriate verb form. If I have time, I will write some letters. If I had time, I _____ some letters. If I had had time, I _____ some letters.
【判断题】If I had time, I shall see the new film.
【单选题】If I had time, I ___French.
【单选题】If I had time()see that new movie at the University Theatre.