We learned a little Japanese ___ we were in Japan .( C )A:as B :till C :while

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We learned a little Japanese ___ we were in Japan .( C )A:as B :till C :while
We learned a little Japanese ___ we were in Japan .( C )
A:as B :till C :while

We learned a little Japanese ___ we were in Japan .( C )A:as B :till C :while
不看选项的话,句子大意是:我们在日本期间,学了一点日语.
很容易排除B
as在引导从句时,表示动作同时发生,强调动作的一致性
while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词时间的一致性,
while从句动词必须是延续性