题目内容

By the time I was five, I          learning English.
A．had startedB．have startedC．startedD．have been
A

试题分析：根据题意可知，开始学英语是在我我五岁之前，所以应该用过去完成时，故排除BCD。本句的意思是“当我五岁的时候，我开始学英语。”所以本题选A。
点评：本题的关键是，首先应该确定是过去完成时，然后注意应该用延续性动词还是非延续性动词。
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