21. The sportsman didn’t manage to break ______ record, but it was ______ good try.
A. a, the B. a, 不填 C. the, a D. the, 不填
22. There is no doubt _____ he is the most suitable man for the job.
A. which B. what C. whether D. that
23. The Bai ethnic group has a population of around two million, 90% of ______ live in Yunnan.
A. them B. which C. whom D. it
