Answer :
The sentence where the underlined noun clause contain an introductory word that has no function within the clause is A. The miners believed that they could find gold quickly.
What is a noun cluase?
It should be noted that a noun clause means a dependent clause that takes the place of a noun in the sentence.
In this case, the sentence where the underlined noun clause contain an introductory word that has no function within the clause is that the miners believed that they could find gold quickly.
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