问题补充：
--- Betty, could you answer my question?
--- Sorry, Mr. Green. I didn’t hear you. I about something else.
A. was thinking
B. am thinking
C. think
D. thought
答案：
(答案→)A. was thinking
B. am thinking
C. think
D. thought
解析：句意：贝蒂，你能回答我的问题吗？——抱歉，格林老师。我没听清。我（刚才）正在想其它事情。结合语境可知下文指的是刚才正在进行的动作，故用过去进行时态。选A。
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