21. Frank studied _____English language in London for four years, so he gets ____ good knowledge of London.
A. a; the B. / ; / C. / ; a D. the; a
22. Zunhua is one of the famous tourism destinations, _____ lies Dongling, a group of the Qing Imperial Tombs.
A. 20 miles northwest of it B. 20 miles northwest of which
C. northwest 20 miles to it D. northwest 20 miles of which
