求正确答案:He made another wonderful discovery,____of great impoortance to science.A:which ithink is; B:which I think it is; C:which I think it; D:I think which is;

问题描述:

求正确答案:He made another wonderful discovery,____of great impoortance to science.
A:which ithink is; B:which I think it is; C:which I think it; D:I think which is;