57.
Your Answer is
Correct Answer is A
Explanation
Here is the omission of a parallel compound sentence, and two sentences are paralleled, and the auxiliary verb in the second half of the sentence can be omitted. The complete sentence here is: a longhouse could be built and Miami religious ceremonies (could be)conducted. Therefore A is correct.
Item B: The voices before and after are different, wrong.
Item C: Different from the previous sentence pattern, at this time the two parallel sentences of and need to have a comma.