问题补充：
－I like this pair of trousers a lot. Can I ?
－Yes, of course,
A. try on them
B. try on it
C. try them on
D. try it on
答案：
A. try on them
B. try on it
(答案→)C. try them on
D. try it on
解析：句意：—我非常喜欢这条裤子，我能试一下吗？—当然可以。trousers裤子，复数形式用them指代；当是人称代词时，要将人称代词放在try与on之间，故选C
