找出下面单词中不同类的一个,把它的序号写到前面的括号里。(10分)
We wash the clothes________ a Sunday morning.A. in B. on
These slippers ______oldA.is B. are
She _______ wearing a pink and purple skirt.A. is B. am
________hat is this?A. What. B. Whose
The pants ________ too small.A.is B.are