作业帮完成句子： He___________(开始集邮）when he was ten years old.(start)
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完成句子： He___________(开始集邮）when he was ten years old.(start)
完成句子： He___________(开始集邮）when he was ten years old.(start)
完成句子： He___________(开始集邮）when he was ten years old.(start)
started collecting stamps
He_started collecting stamps/ to collect stamps_(开始集邮）when he was ten years old.(start)