21．Brian is gifted in writing music; he is very likely to be ____ Beethoven.
A. a B. an C. the D. 不填
22．— Many students study well but have poor physical fitness.
—That’s why our government has decided to include students’ P.E. performance as a____ for admission to universities.
A. reputation B.criterion C.commitment D.consensus
23．The books on the desk, ____ covers are shiny, are prizes for us.
A. which B. what C. whose D. that
24．_____ we understand things has a lot to do with what we feel.
A. Where B. How C. Why D. when
25．—Have you finished the arrangement of the hall?
—Yes. I ____on it for two hours.
A. have worked B.had worked C. have been working D. worked
