When the teacher talked ____ the students,they kept their hands ____ their sides.A with;at B to;

问题描述:

When the teacher talked ____ the students,they kept their hands ____ their sides.A with;at B to;
Every morning ,my elder brother left home ___ in s smart black suit.A dress B dressing C dressed

B to,by
C dressed
第二题中为什么选C?他被一件黑西装打扮起来。。。。这里要用dressed