. On average, there are 800 tornadoes in
问题:
.
On average, there are 800 tornadoes in the U.S. each year, _______ about 80 deaths and 1,500 injuries.
A.cause
B.caused
C.to cause
D.causing
.
On average, there are 800 tornadoes in the U.S. each year, _______ about 80 deaths and 1,500 injuries.
A.cause
B.caused
C.to cause
D.causing