【单选题】
A <{p}>has spent less time on his stamps<{br/}><{/p}>
B <{p}>has begun to sell some of his collecting<{br/}><{/p}>
C <{p}>has given up the hobby of stamp-collecting<{br/}><{/p}>
D <{p}>is feeling tired of collecting any more stamps<{br/}><{/p}>
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