问题
选择题
_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate. [ ]
A. As
B. While
C. Because
D. If
答案
答案：B
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_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate. [ ]
A. As
B. While
C. Because
D. If
答案：B