问题
选择题
The little boy jumped up and down happily when he saw a bee _____ into the house. [ ]
A. flown
B. to fly
C. flying
D. has flown
答案
答案：C
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The little boy jumped up and down happily when he saw a bee _____ into the house. [ ]
A. flown
B. to fly
C. flying
D. has flown
答案：C