【題目】________you start a task,you must finish it on time.

A.UnlessB.UntilC.ThoughD.Once

【答案】D

【解析】

句意：你一旦開(kāi)始一件任務(wù)，就必須把它完成。

考查連詞。A. Unless除非；B. Until直到；C. Though盡管；D. Once一旦。觀察句子邏輯關(guān)系，應(yīng)該是“Once一旦”，故選D。

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