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新概念英语第二册53课练习册答案!

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新概念英语第二册53课练习册答案!
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答案和解析
Lesson 53
A
1.have just put out,put out,have been putting out
2.have been trying,tried,have tried
3.have been smoking,have already smoked,smoked
4.thought,has thought / has been thinking,has been thinking
B
1.away 2.quiet 3.to 4.at 5.quite
6.drop 7.fell 8.reason 9.cause 10.caused
C
1.a 2.c 3.c 4.c 5.b 6.c