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【题目】He has studied hybrid rice ______.

A.since ten yearsB.for ten years agoC.ten years agoD.since ten years ago

【答案】D

【解析】

句意:他从十年前就开始研究杂交水稻了。

考查时态。根据句中has studied 确定时态为现在完成时;排除C;现在完成时可用“for+时间段”做时间状语,表示持续了多长时间,排除Bsince引导现在完成时,其后要用一般过去时态的句子或时间点,ten years表示的时间段,排除Aten years ago是表示一般过去时的时间点且用于since之后,故选D

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