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I had no clue what he was trying to suggest because he just couldn’t______ the subject.
A、keep to
B、keep up with
C、keep off
D、keep out of
【正确答案】：A
【题目解析】：原句的意思是“我不知道他想说什么因为他总跑题。” 因此我们选择A. keep to（使谈话不离题）。