You should keep it in mind: Don’t important things too quickly; instead, you should think twice before you go.
A. decide on B. depend on C concentrate on D. focus on
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解析：考察动词短语辨析。A决定；B依靠，依赖；C集中注意力于…；D聚焦于；句意：你应该记住，，对于重要的事情，不要过快地做出决定。相反在你行动之前，你应该仔细思考。根据句意说明A正确。