Collecting stamps as a hobby increasingly popular during the past fifty years.A. becomesB.

发布时间：2020-08-17 11:56:57

Collecting stamps as a hobby     increasingly popular during the past fifty years.
A. bees
B. became
C. has bee
D. had bee

网友回答

A. bees
B. became
(答案→)C. has bee
D. had bee
解析：主语collecting stamps as a hobby被看成是整体，谓语动词用第三人称单数形式。而时间状语during the part fifty years限制了句子用完成时态。
【标签】动名词作主语
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