There is always the ____of an earthquake in this region but so far there has been no sign

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There is always the ____of an earthquake in this region, but so far there has been no sign of trouble

A.impossible

B.possible

C.possibility

D.impossibility

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。