Question

The entire class as well as/was agreed to the proposal/ the principal​

Answer 1

The entire class as well as the principal was agreed to the proposal.

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Answer 2

The entire class as well as/was agreed to the proposal/ the principal:

The entire class as well as the principal had agreed to the proposal.

A sentence in English always starts with a capital letter. Therefore, your sentence will start with "The" and the word had will be inserted after principal.

Hence the answer is: The entire class as well as the principal had agreed to the proposal.

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