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提升 Ⅲ . Choose the best answer from the given choices. 1. — Linda, I called you this morning, but nobody answered the phone. — I’ m sorry. I ___ football with my friends then. A. play B. played C. am playing D. was playing 2. When Jim’ s mother came in, he ___ his homework. A. is doing B. has done C. was doing D. does 3. Sally took a photo of her friends while they ___ puter games. A. play