Theyoftenhelpedeachotherwhentheywereatschool.把这句话改成否定句和疑问句.急
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题目内容：
They often helped each other when they were at school.把这句话改成否定句和疑问句.
急
优质解答
They didn't often help each other when they were at school.
Did they help each other when they were at school?
本题链接：
