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( 3分鐘) ( 1) My sister is having a great time B my uncle. A. visit B. visiting C. to visit ( 2) He is happy C by the pool. A. sit. B. sitting C. to sit. ( 3) Our parents often ask us C hard. B . studying C. to study D. studyed 環(huán)節(jié)說明:通過這個(gè)環(huán)節(jié)的學(xué)習(xí),讓學(xué)生對(duì)現(xiàn)在進(jìn)