my mother is busy ____ the room.A,clean B.to ciean C,cleaning D,cleans
问题描述:
my mother is busy ____ the room.A,clean B.to ciean C,cleaning D,cleans
答
C
答
C
be busy doing sth
答
C “be busy doing”有这个短语
答
B
答
选C.be busy doing 有这个短语.
答
b