.--- I’m sorry I stepped outside for a smoke. I was very tired..
--- There is no ________ for this while you are on duty.
A．reasonB．excuseC．causeD．explanation
B

試題分析：名詞辨析。A原因；B借口；C原因；D解釋；句意：—對不起我要出去抽支煙。我太累了�！斈阍谥蛋嗟臅r候，不應(yīng)該有這樣的借口。根據(jù)句意說明B正確。
點評：名詞的詞義辨析要放在上下文語境中進行。要根據(jù)句意以及固定搭配來選擇合適的名詞。
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