what are you doing?i'm reading a book by Mark Twain.A.writte

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what are you doing?i'm reading a book by Mark Twain.A.written B.writing C.to write D.write
look!the girls are busy English over there
A.practising speaking B.practising speak

1.选A
I'm reading a book written by Mark Twain.
这里book 和write是被动关系,所以要用过去分词
2.选A
busy doing sth 意思是：忙着做某事,相当于busy in doing sth.
practise doing sth.意思是：练习做某事

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