单项选择题

By next summer he ______ in the biology school of Harvard University for three years.

A．will have been studying
B．have studied
C．will study
D．will be studying
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Dear Editor,Please send me, if you have any now, export guides for Columbia, Argentina, and Brazil ( I learned about the guides on the newspaper of Jan. 21,2001 ).If the guides are not available now but will be in the future, I would appreciate your placing me on the mailing list to receive them upon publication.
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