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He is a key ____________ in the murder so we must protect him from all kinds of danger.
A.witchB.watcherC.wizardD.witness
D
词义辨析。A.巫婆   B.观察者  C.术士   D.证人,目击者。句意:他是这起凶杀案中的关键证人,因此必须保护他避免各种危险。故选D。
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