---Why is Peter working so hard these days?---The _______ of failing the exam next week makes him do so.A.announcementB.threatC.petenceD.dilemma
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B解析名词词义辨析题。A. announcement 宣布 B. threat 威胁 C. petence 能力 D. dilemma 两难 “为什么皮特这些天如此努力？”“下周考试的逼近让他如此”。选B