Only in that way _____ find out how this kind of animal lived and then finished the research on timA.could theyB.they couldC.were they able to D.they were able to 选哪个?为什么?

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Only in that way _____ find out how this kind of animal lived and then finished the research on timA.could theyB.they couldC.were they able to D.they were able to 选哪个?为什么?
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 _____ find out how this kind of animal lived and then finished the research on timA.could theyB.they couldC.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.

A
貌似因为句子中出现了only,所以要倒装~
不知道对不对,请楼下的更正~

A
首先要倒装
其次注意be able to 和can 的区别
be able to 指人的能力
can 指能做什么

A
强调句,要倒装!