Collecting stamps as a hobby___________ increasingly popular

Collecting stamps as a hobby___________ increasingly popular during the past fifty years.
A.becomes
B.became
C.has become
D.had become
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答案C
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.

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