The genetic engineering progress has been very rapid recently is perhaps the most impor

问题补充：

The genetic engineering, progress has been very rapid recently, is perhaps the most important of all the sciences．

A. to which

B. with which

C. in which

D. for

答案：

A. to which

B. with which

(答案→)C. in which

D. for

解析：考查定语从句。have rapid progress in在……有迅速的进步，故用in which，选C。