问题描述：
现在完成时练习一 用since和for填空 1.______ two years 2._______ two years ago
.3_______last month 4._____1999 5.______yesterdy 6._____4o'clock 7._____4 hours8._____an hour ago 9._____we were children 10.____-lunch time 11._____she left here
.3_______last month 4._____1999 5.______yesterdy 6._____4o'clock 7._____4 hours8._____an hour ago 9._____we were children 10.____-lunch time 11._____she left here
问题解答：
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