單項(xiàng)選擇。
— Where are the runners? 　　　
— Over there. They ______ warming-up exercises.

A. is doing　　　
B. do 　　　
C. are doing 　　　
D. does
C
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科目：初中英語(yǔ) 來(lái)源：專(zhuān)項(xiàng)題 題型：單選題

單項(xiàng)選擇。
— Where are the runners? 　　　
— Over there. They ______ warming-up exercises.
[     ]
A. is doing　　　
B. do 　　　
C. are doing 　　　
D. does

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