作业帮It all happened a long time ____.A,before B,ago C,for D,since
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It all happened a long time ____.A,before B,ago C,for D,since
It all happened a long time ____.
A,before B,ago C,for D,since
It all happened a long time ____.A,before B,ago C,for D,since
选B.ago
A.C,D,后面需要接时间状语