We can hear sound because our earth is s
题型:选择题
问题:
We can hear sound because our earth is surrounded by thick air _____ sound can travel.[ ]
A. in that
B. by which
C. with which
D. through which
We can hear sound because our earth is surrounded by thick air _____ sound can travel.[ ]
A. in that
B. by which
C. with which
D. through which