When television was first introduced, th
题型:选择题
问题:
When television was first introduced, the extent _______ it would affect society could not have been foreseen.
A.of which
B.of what
C.to which
D.in which
When television was first introduced, the extent _______ it would affect society could not have been foreseen.
A.of which
B.of what
C.to which
D.in which