A：I need . Where are they?B：On the desk.A. some rulerB. a pens C. two pencilsD. three map

问题补充：

A：I need . Where are they?

B：On the desk.

A. some ruler

B. a pens

C. two pencils

D. three map

答案：

A. some ruler

B. a pens

(答案→)C. two pencils

D. three map

解析：此题重点考查名词的复数形式。