21．The China Anhui Investment and Trade Expowas successfully held on November 8-11
in Hefei, _______ capital city of Anhui Province, as well as ________ big city in China.
A．a; a B．the ; a C．a; the D．the; the
22．While walking in the street, the girl suddenly caught sight of the dress which ______ in the window of a clothing store.
A. was hanging B. was being hung C. is being hung D. hung
