问题
选择题
— What ____________ the old men ____________?
— They are running.[ ]
A. are; do
B. are; doing
C. is; do
D. is; doing
答案
答案：B
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— What ____________ the old men ____________?
— They are running.[ ]
A. are; do
B. are; doing
C. is; do
D. is; doing
答案：B