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Only in that way _____ find out how this kind of animal live

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/14 15:47:16
Only in that way _____ find out how this kind of animal lived and then finished the research on tim
A.could they
B.they could
C.were they able to
D.they were able to
选哪个?为什么?
Only in that way..需要用倒装 首先排除 B,D
be able to do 强调有能力去做什么事情
could can的过去式 能做什么,能够
C
只有通过这样的方式他们才能够了解这种动物是怎样生活的,最后才能完成对其的研究.