题目内容
【题目】My parents have lived in the town _________ their son was six years old.
A. for B. since C. while D. when
【答案】B
【解析】句意：我父母自从他们的儿子六岁开始一直住在这个城镇。根据句意，结合谓语动词have lived为现在完成时态，而since为现在完成时态的标志。故答案为：B.
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题目内容
【题目】My parents have lived in the town _________ their son was six years old.
A. for B. since C. while D. when
【答案】B
【解析】句意：我父母自从他们的儿子六岁开始一直住在这个城镇。根据句意，结合谓语动词have lived为现在完成时态，而since为现在完成时态的标志。故答案为：B.
