21. Chen Zhijiang is ____ paper-cutting expert whom I interviewed for my article on _____
Chinese Art.
A. a; the B. an; / C. a; / D. an; the
22. They set off early on Tuesday morning _______ at the destination three days later.
A. arriving B. arrived C. and arrived D. would arrive
23. Excited to see you back safe and sound from Libya. How long _____in Libya?
A. have you stayed B. did you stay C. had you stayed D. would you stay
