问题
选择题
单项选择。
— Where are the runners?
— Over there. They ______ warming-up exercises. [ ]
A. is doing
B. do
C. are doing
D. does
答案
答案：C
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单项选择。
— Where are the runners?
— Over there. They ______ warming-up exercises. [ ]
A. is doing
B. do
C. are doing
D. does
答案：C