1.B 因为用have been doing表示到现在为止一直在做某事,起强调作用.
where were you表示你当时在哪里,而现在一定已经找到了才会说话的.
2.B吧
因为By the time后面紧跟的短语表示by the time中的这个time.
而后面跟着的句子就一定要完成时了.
不定项选择：1)Hello,I__to telephone you all day.Where____?A)tried;
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