His English is Aexcellent because he Bhas been speaking Csince he Dwas been a boy of twelve.

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问题 His English is Aexcellent because he Bhas been speaking Csince he Dwas been a boy of twelve.

选项

答案他的英语很优秀，因为他从12岁时起就一直在说英语。

解析选D，was been→was。本题考查时态。分析句子结构可以看出because这个原因状语从句里面含有主从复合句结构，he has beenspeaking是主句，since引导时间状语从句。Since引导时间状语从句时主句一般用现在完成时或现在完成进行时，而从句一般用一般过去时。

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