[单选题]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
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)。
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