---We were badly treated in the hospital.
---Don’t worry.The president has promised to ______ your plaint at once.A.look upB.look intoC.look back onD.look forward to
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B解析考查短语辨析。look up 查字典，look into 调查，look back on 回顾，look forward to 期望，句意：在医院我们被对待的不好，别担忧，院长已经答应了马上调查你的抱怨。所以选B。