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(2014重庆一中高三下第三次月考)4. —Why! I couldn’t get you on the phone yesterday afternoon?

—We _____ kites in the yard when you phoned.

A. could be flying

B. might have flied

C. must have been flying

D. should be flying

高三英语单项填空困难题

少年,再来一题如何?
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