I'm really concerned ahout you. If something _______ happen to you  call me at once.
A．wouldB．shouldC．couldD．might
B

試題分析：句意：我真的很關(guān)心你，如果有什么事情發(fā)生，立刻打電話給我。這里是if條件句是虛擬語氣，和將來相反用should do，選B。
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