题干
—Is Sally cleaning her house?
— .
A：Yes, she isn't
B：No, she is
C：Yes, he is
D：No, she isn't
答案(点此获取答案解析）
D
—Is Sally cleaning her house?
— .
A：Yes, she isn't
B：No, she is
C：Yes, he is
D：No, she isn't
