Mr Smith ()(learn)Chinese for two years before he came to China 动词填空.

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Mr Smith ()(learn)Chinese for two years before he came to China 动词填空.
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Mr Smith ()(learn)Chinese for two years before he came to China 动词填空.
Mr Smith ()(learn)Chinese for two years before he came to China 动词填空.

Mr Smith ()(learn)Chinese for two years before he came to China 动词填空.
has been learning

had learned

has learned/learnt 或has been learning
“俊狼猎英”团队为您解答,祝学习进步!

这里应该使用过去完成时 主语+done
had learnt
希望能帮到你哦~

has learnt
for+一段时间,时态用现在完成时,Mr Smith是第三人称单数,用has