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19、--- I’m sure Tom will pass the final examination．

--- I think so．He            for it for months．

A．had been preparing                                   B．was preparing

C．is preparing                                              D．has been preparing

19、D

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--- I’m sure Tom will pass the final examination．

--- I think so．He            for it for months．

A．had been preparing                                   B．was preparing

C．is preparing                                              D．has been preparing

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