My sister and I both collect stamps，but hers________better than mine．A.isB.wasC.areD.were
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C解析分析：此处的主语是hers，名词性物主代词可能是单数也可能是复数，必须根据上下文来进行判断。上文My sister and I both collect stamps，因此这里的hers还原的话应该是her stamps，所以是复数，又从上文来看是指现在时间，所以选C项are．(延伸)名词性物主代词指的是单数的例子：Our classroom is on the first floor，but theirs is on the second floor．(theirs还原是their classroom，所以是单数。)(延伸)名词所有格也要根据上下文来判断单数还是复数，如：Mary and I went shopping last Sunday．She and I bought a lot of clothes．But Mary's were more expensive than mine．此处通过还原可以知道Mary's就是Mary's clothes，应该是复数。