问题
选择题
I English since I was five years old.
A．learn
B．learned
C．will learn
D．have learned
答案
答案：D
句中含有since引导的时间状语从句，主句通常用现在完成时，结构为have+过去分词，学习learn的过去分词learned，故本题选D。
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I English since I was five years old.
A．learn
B．learned
C．will learn
D．have learned
答案：D
句中含有since引导的时间状语从句，主句通常用现在完成时，结构为have+过去分词，学习learn的过去分词learned，故本题选D。