A:0个
B:1个
C:2个
D:3个
用下列词语造句
①仔细
②敬礼
A:What's the matter?
B:I have ____ ____.
A:I'm sorry to hear that.____ ____.
B:Thank you.
多项式6ab2c﹣3a2bc+12a2b2的公因式是( )