20. _________ are a fundamental unit of conversational structure. A. back-channel signals B. adjacency pairs C. pre-sequences D. insertion sequences ...

4. The Swiss linguist de Saussure regarded the linguistic sign as composed of sound image and referent. A. 错误 B. 正确 ...

13. My grandfather was a very clever man. He ____speak five languages. A. could B. be able to ...

18. .His parents wouldn't let him marry anyone whom family was poor. A. 错误 B. 正确 ...

6. He came into the room, his ears red with cold. A. 错误 B. 正确 ...

4. She wasn’t at home when I phoned but I ________contact her at her office. A. could B. be able to ...

7. Mary ______ my letter; otherwise she would have replied before now. A. has received B. should have received C. couldn’t have received D. shouldn’t have received ...

17. If we shouldn' t have an exam this afternoon. I would go shopping now. A. 错误 B. 正确 ...

9. He is seemed to have lived in England for many years. A. 错误 B. 正确 ...

7. The boy _________ I believed to be honest deceived me. A. who B. whom ...