The historical palace is believed ______ by renowned Venetian master builders in the early fifteenth century.

Answer and explanation

Correct answer: B. to have been designed

  1. Step 1: Passive reporting verbs ('is believed') take a perfect passive infinitive ('to have been + past participle') when referring to past events. This indicates that the architectural design occurred centuries prior to the present belief. Answer: to have been designed. Why not the others: "having been designed by local builders" uses a participle instead of the mandatory infinitive complement after passive reporting verbs; "to be designed then" uses present infinitive, falsely implying simultaneous contemporary construction; "being designed well" uses a gerund participle phrase which is syntactically invalid following 'is believed'.

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