Question

Read the sentences. Immigrants often settled in cities. The cities were home to industry. Which sentence combines the sentences by inserting a word? Immigrants often settled in cities, which were home to industry. Immigrants often settled in industrial cities. Immigrants, interested in industry, often settled in cities.

Answer 1

When looking for this answer, we know that you have to insert a word. I would go with choice, "A". That is the only choice that inserts a new word 'which'.

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Answer 2

Which sentence combines the sentences by inserting a word?

Immigrants often settled in cities, which were home to industry.

The word "which" combined the two sentences to create a unified idea.  

The function of the word "which" is to provide additional information about the previous sentence that may relevant to fully understand it.  

This is in contrast to the word "that" whose function is to limit what the sentence is trying to say.