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Some people who collecting stamps____ they were children(选择)

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Some people who collecting stamps____ they were children(选择)
Some people who collecting stamps____ they were children might still be collecting stamps when they are 80 years old.
1.since
2.before
3.when
4.after
不知怎么选择,
A 从句意理解看:一些收集邮票的人从他们儿时开始收集,直到他们八十岁可能还在收集.since表示从儿时到八十岁的这个时间段.在其他三个选项中,when后不接延续性动词,而before和after不符合句意.