.--- I’m sorry I stepped outside for a s...

.--- I’m sorry I stepped outside for a smoke. I was very tired..

--- There is no ________ for this while you are on duty.

A．reason

B．excuse

C．cause

D．explanation

B 【解析】试题分析：名词辨析。A原因；B借口；C原因；D解释；句意：—对不起我要出去抽支烟。我太累了。—当你在值班的时候，不应该有这样的借口。根据句意说明B正确。考点：考查名词辨析

考点分析：

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