题目内容：

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

优质解答

1 for
2 since
3 since
4 since
5 since
6 since
7 for
8 since
9 since
10 since
11 since
分析：FOR 后接一段时间； SINCE 接过去的时间点/从句
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