21. _____ man sitting near the window is _____ famous researcher in computer engineering．
A．A; a B．The; a C．The; the D．A; the
22.［2012潍坊模拟］I would like to take this chance to thank my teachers and parents, without _____ I wouldn’t be so successful today.
A. who B. which C. whom D. them
23. The manager _____ one of the hotel servants of stealing the money.
A. scolded B. complained
C. accused D. charged
