(单选题)The police have begun to ______ the murder case, but in vain.(本题1.0分) A.look into B.look up C.look out D.look after

(单选题)The police have begun to ______ the murder case, but in vain.(本题1.0分)
A.look into
B.look up
C.look out
D.look after

出自：桂林理工大学大学英语4

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