HELP 请教一下英语题目

1.--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
"while you are on duty"是什么意思啊?
我选的是D,是错的,为什么啊?
应该选B，no excuse for...对于某件事来说没借口；D项使“解释”，不符合意思；while you are on duty的意思是“在你值班期间”。

2.There are usually at least two_____of looking at every question
A. means B. directions C. views D. ways
我选的是D,为什么是错的啊?
选A\D,这题考查的比较严格，松一点，way和means作为“方法”来说，差别极其细微，所不同之处就是在于，means侧重于表示“做某事的方法”，way强调“做某事的方式”，原文是说“看待问题要用至少三种。。”，用means比较合适。

3.In my opinion,what he told us just now about the affair simply doen't make any_____.
A. meaning B. idea C. sense D. point
这句什么意思啊,我看都看不懂,我选的是A,为什么是错的啊?
make sense意思是“有意义”，句子的意思“依我看来，他刚刚针对那件事对我们说的话毫无意义。”