it is important to pay attention to the time and place　3　occur.

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【解析】选[K]。　3　occur为省略、that的定语从句，先行词为time and place，此处缺少主语，应填一名词复数。此处是说，由于上述原因，留意这些症状发生的时间和地点是很重要的，故答案为[K]symptoms。由上句中的if me symptoms are a result of也能推出答案

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it is important to pay attention to the time and place 3 occur.

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it is important to pay attention to the time and place　3　occur.