一．单项选择（共15小题，计15分）
( ) 1. ─You look so tired, Celia! ─Yes. I volleyball the whole afternoon.
A. play B. am playing C. have been playing D. will play
( ) 2. The tourists are all interested the Great Wall.
A. on visiting B. to visit C. in visiting D. visiting
( ) 3. They have been doing morning exercises they up.
A. since, got B. for, get C. since, get D. for, got
