问题描述：
一道英语选择题：They ___ since they left last July.
（ ）They ___ since they left last July.
A.had been away B.have been away
对的话,请说一下理由.
（ ）They ___ since they left last July.
A.had been away B.have been away
对的话,请说一下理由.
问题解答：
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