I’ll give a talk tomorrow. I’m thinking about .
A. what to say
B. how to say
C. what can I say
D. how can I say
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(答案→)A. what to say
B. how to say
C. what can I say
D. how can I say
解析：think about表示考虑，思考。“疑问词 + 动词不定式”是英语中常用的一种结构。在句中可以作主语、动词或介词的宾语以及表语。