3. Glad to see you back. How long in Russia?
A. did you stay B. have you stayed C. were you staying D. have you been staying
Key: A C were staying 指过去一直呆在某地 而did stay 只指过去某一阶段的事
4. He works in a factory now, but he on a farm for 20 years.
A. worked B. has worked C. had worked D. had been working
Key: A
5. Where on earth have you been? We you back much earlier.
A. were expecting B. are expecting C. had expected D. expect
Key: C
6. ---I beg your pardon!
---Oh, you to me carefully. (just now)
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