since 后面加点时间 而且还在完成时中可以和ago连用； for 后面加段时间
1 for 2 since 3 since 4 since 5 since 6 since 7 for 8 since 9 since 10 since 11 since
1 since 2 since 3 for 4 for 5 since
求高手解答现在完成时练习2.用since和for填空1) ______ two years 2) _______ two
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