we are busy ( )our lessons these days.a ,prepare!b,preparing c,to prepare d,prepared大哥大姐帮忙分析一下,为什么选B,

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we are busy ( )our lessons these days.a ,prepare!b,preparing c,to prepare d,prepared大哥大姐帮忙分析一下,为什么选B,

we are busy ( )our lessons these days.a ,prepare!b,preparing c,to prepare d,prepared大哥大姐帮忙分析一下,为什么选B,
we are busy ( )our lessons these days.a ,prepare!b,preparing c,to prepare d,prepared
大哥大姐帮忙分析一下,为什么选B,

we are busy ( )our lessons these days.a ,prepare!b,preparing c,to prepare d,prepared大哥大姐帮忙分析一下,为什么选B,
be busy doing是固定用法 表示忙于做某事
eg:They are busy getting in the potatoes now.
他们现在正忙于收马铃薯.

Be busy doing sth 是一个句型。记住就好啦

b
be busy doing sth忙于做某事。
老师祝你学习进步!
望采纳,多谢!^_^