问题
选择题
.
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
答案
答案：D
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.
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
答案：D