this pair of trousers ( ) dirty,you can't put( )on A.is,it B..are,them C.is,themthis pair of trousers ( ) dirty,you can't put( )on A.is,it B..are,them C.is,them
问题描述：
this pair of trousers ( ) dirty,you can't put( )on A.is,it B..are,them C.is,them
this pair of trousers ( ) dirty,you can't put( )on
A.is,it B..are,them C.is,them
答
选A
trousers, glasses, clothes, shoes, 等词作主语时，谓语用复数，但如果这些名词前有a (the) pair of等量词修饰时，谓语动词用单数。如：My glasses are broken. / The pair of shoes under the bed is his.
答
选B. 本句中的主语是trousers而不是pair,所以系动词be用复数形式are，后面一样，代词用复数them。
答
A
this pair of trousers 谓语用单数。
it代替 this pair of trousers
答
B..are,them
答
答案是C .前半句this pair of trousers这双鞋是单数,答案为 is 后半句put them on 穿上他们是复数.