Sam didn’t _ dad. ( )A.help B.helps C...
2023-01-06
【题目】Sam didn’t ________ dad. ( )
A.help B.helps C.helped
【答案】A
【解析】
句意：山姆没有帮助爸爸。助动词did后跟动词原形，A是原形，B是单三式，C是过去式，故选A。
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