One reason earthquakes are so hard to predict is that they don’t seem to follow any regular pattern or schedule, they appear to occur almost at ______. A investigation B random C mission D compass

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One reason earthquakes are so hard to predict is that they don’t seem to follow any regular pattern or schedule, they appear to occur almost at ______.
A
investigation
B
random
C
mission
D
compass

参考答案

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河北建筑工程学院--电力电子技术