在PubMed中进行词组检索时，不能强制将blood pain 作为一个词组进行检索的是（）

答案查看网，轻松搜题/搜资源

【单选题】【消耗次数：1】

① blood pain

② [blood pain]

③ blood pain[tw]

④ blood-pain

⑤ blood pain*

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