Despite their extensive efforts to determine the mode of oil ___, scientists still have not ___the process by which oil is produced.
这两个选项:
1. creation investigated
2. genesis established
科学家们已经做出了“找”这个动作,也就是extensive efforts,也就是你想选的investigate,所以就不能选 still have not investigate了,而是还没有达到下一个程度;establish-建立一种theory之类的,也就是investigate的结果。作者: zlkklz 时间: 2017-10-16 21:45:04
张小猪要发达 发表于 2017-10-15 20:54
科学家们已经做出了“找”这个动作,也就是extensive efforts,也就是你想选的investigate,所以就不能选 s ...