Tom in the library every night over the last three months.Tom ——————— in the library every night over the last three months.A had been working B have been working 哪一个 为什么.

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Tominthelibraryeverynightoverthelastthreemonths.Tom———————inthelibraryeverynightoverthelastthreemont

Tom in the library every night over the last three months.Tom ——————— in the library every night over the last three months.A had been working B have been working 哪一个 为什么.
Tom in the library every night over the last three months.
Tom ——————— in the library every night over the last three months.
A had been working B have been working 哪一个 为什么.

Tom in the library every night over the last three months.Tom ——————— in the library every night over the last three months.A had been working B have been working 哪一个 为什么.
你给的选项都是错的.答案应该是
has been working
语法:
over the last three months.----------在你的语境里面,时态是现在完成(进行)时.