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（友情提示：鼠标拖选单词即时翻译）
21. Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight against SARS, so we had not enough time for a talk.
A. just left B. has just left
C. is just leaving D. was just leaving
22. —You've made great progress in your English study, haven't you?
—Yes, but much .
A. remains to do B. is remained to do
C. remains to be done D. is remained to be done
23. — You can't finish the book in less than an hour, I suppose?
— .
A. Yes, I'm sure I can B. No, hardly
C. Sorry, I can't D. I don't think I can
24. The twins，_______ so long，held each other and burst into tears．
A．being separated B．having been separated
C．having separated D．had been separated