my mother is busy ____ the room.A,clean B.to ciean C,cleaning D,cleans

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mymotherisbusy____theroom.A,cleanB.tocieanC,cleaningD,cleansmymotherisbusy____theroom.A,cleanB.tocie

my mother is busy ____ the room.A,clean B.to ciean C,cleaning D,cleans
my mother is busy ____ the room.A,clean B.to ciean C,cleaning D,cleans

my mother is busy ____ the room.A,clean B.to ciean C,cleaning D,cleans
选C.be busy doing 有这个短语.

B

C

b

C “be busy doing”有这个短语

C
be busy doing sth