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

发布时间：2020-08-15 00:44:40

--- 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：此处用one表示泛指。keep looking继续找。
以上问题属网友观点，不代表本站立场，仅供参考！