Collecting stamps as a hobby___________ increasingly popular during the past fifty years.
A．becomesB．becameC．has become D．had become
C
主語collecting stamps as a hobby被看成是整體，謂語動(dòng)詞用第三人稱單數(shù)形式。而時(shí)間狀語during the part fifty years限制了句子用完成時(shí)態(tài)。
【標(biāo)簽】動(dòng)名詞作主語
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