The genetic engineering, ______ progress
问题:
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
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