问题
选择题
The recent earthquakes have caused concern because they happen _____ population centers and have caused huge damage.
A．to be hit
B．hitting
C．having hit
D．to have hit
答案
答案：D
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The recent earthquakes have caused concern because they happen _____ population centers and have caused huge damage.
A．to be hit
B．hitting
C．having hit
D．to have hit
答案：D