Question

join together each of the following pairs of sentences by means of connective
1)this is the building. it was built in a single month
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Answer 1

Answer:

This is the building which was built in a single month.

Explanation:

Because the two sentences are

This is the building. It was built in a single month.

and if there is 'it' on the beginning of the second sentence, we usually use which.

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