1.

In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement"._x005F_x000D_ Tunnels (is built) to connect houses and places of worship whereas innovative trick doors were attached to the underground cities.

A. was built
B. were built
C. were building
D. no improvement
Answer» C. were building


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