I found he_______(explain) the problem to his students when

I found he_______(explain) the problem to his students when I walked into his office.
char_min 1年前 已收到1个回答 举报

xudong88 幼苗

共回答了20个问题采纳率:80% 举报

was explaining过去进行时,表示我走进办公室的时候他正在进行,是同时发生,且为过去,所以用过去进行时

1年前

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