Question

we had already taken a tea change into voice​

Answer 1

Answer:

A tea had already been taken by us

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Answer 2

Here is the correct answer:

Tea had already been taken by us.

Explanation

Since tea is an uncountable noun, we should not use 'a' with it.

The verb in the sentence was in Past Perfect active voice form (had knocked down). When we convert the active voice of Past Perfect into passive, we use passive form equivalent to the active form. The passive form in Past Perfect is had been+V3.  The object is made the subject and vice versa; and 'by' is added.