Everyone should learn something about first aid，for every second will ________ in an emergency.
A．playB．count
C．happenD．show
B

句意為：每個人都應該學點急救知識，因為在緊急情況下每一秒都很重要。play玩； count起關鍵作用；happen發(fā)生； show展示。
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