Tom ____ stamps since he was nine. (collect)

电梯直达

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发表于 2014-5-20 18:01:03 | 只看该作者回帖奖励

试卷: 时态练习01--用单词的正确形式填空[查看]
Tom ____ stamps since he was nine. (collect)

参考答案: has been collecting

本题解释:
since he was nine为现在完成时或现在完成进行时的标志

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