.--- 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(duì)不起我要出去抽支煙。我太累了�！�(dāng)你在值班的時(shí)候，不應(yīng)該有這樣的借口。根據(jù)句意說(shuō)明B正確。
點(diǎn)評(píng)：名詞的詞義辨析要放在上下文語(yǔ)境中進(jìn)行。要根據(jù)句意以及固定搭配來(lái)選擇合適的名詞。
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