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UNIT 9 Owing to an unforeseen difficulty—Talking about cause and effect(2) 1

UNIT 10 I m getting better—Using comparatives 27

UNIT 11 Hardly ever. Well, quite often—Expressing frequency 52

UNIT 12 That s all very well, but—Expressing opinions, agreeing and disagreeing 76

UNIT 13 What does that mean?—What to say when you don t understand 102

UNIT 14 You may be stupid, but not that stupid—Using model verbs 127

UNIT 15 Er…um…well, I m not sure—Hesitating 151

附录一 总复习题 175

附录二 参考练习 182

附录三 练习答案 222

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