从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21．After silence of several minutes, he came towards her and said, “I have struggled with my feelings, but without success．”
A．a; the B．the; a C．不填; a D．a; 不填
22．—What do you think of the furniture on exhibition?
—Well, great！But I don't think much of _______ you bought．
A．the one B．it C．that D．which
