问题
选择题
Once education is made free，many children who have dropped out of school .
A．will come back
B．came back
C．have come back
D．had come back
答案
答案：A
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Once education is made free，many children who have dropped out of school .
A．will come back
B．came back
C．have come back
D．had come back
答案：A
