为什么it was 不可以省略? 大全764 The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970’s. (A) extinction; its numbers are now five times greater than (B) extinction; its numbers are now five times more than (C) extinction, their numbers now fivefold what they were (D) extinction, now with fivefold the numbers they had (E) extinction, now with numbers five times greater than the key:A。 省略掉its numbers were, 但前后时态不同,为什么可以省略? |