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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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