问题
选择题
It was not easy to let all the children ________ into the classroom in a short time. [ ]
A. run
B. to run
C. running
D. ran
答案
答案：A
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It was not easy to let all the children ________ into the classroom in a short time. [ ]
A. run
B. to run
C. running
D. ran
答案：A