我也是学新概念的，不过，对不起呀，我爱莫能助
练习答案 Key to written exercises
Lesson 86
A
1 She has just boiled an egg.
3 She has never been to China, but he was there in 1992.
4 He has already painted that bookcase.
7 He has just dusted the cupboard.
B
1 I've already cleaned my shoes.
I cleaned my shoes last night.
2 I've already opened the window.
I opened the window an hour ago.
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