My father is busy __ a letter,and I am busy
问题描述:
My father is busy __ a letter,and I am busy
My father is busy __ a letter,and I am busy __my homework.
A.write,with B.writing,with C.write,doing D.writing,do
答
选B.
be busy with sth
be busy (in) doing sth
这两种用法都可以.但是没有be busy do sth.