--- I let my secretary call you several times. Do you know that?
---- I in a meeting. I’m sorry.
A. had been
B. was
C. am
D. have been
网友回答
A. had been
(答案→)B. was
C. am
D. have been
解析：考查时态。句意：我让我的秘书给你打了几次电话。你知道吗？——我当时正在开会。抱歉。可知下文描述的是秘书打电话时正在进行的动作，故用过去进行时态，主语是I故用am的过去形式，选B。