--There must be a dozen pens in this house but I can never find one when I need one. -

发布时间：2020-08-17 14:10:45

----- There must be a dozen pens in this house but I can never find one when I need one.   ---- Keep looking.     is sure to turn up.
A. One
B. It
C. That
D. This

网友回答

(答案→)A. One
B. It
C. That
D. This
解析：此处One特指上文提到的“the one I need”。
以上问题属网友观点，不代表本站立场，仅供参考！