Answer:C
Explanation: Thats the answer
"It was hard being the captain of the Constellation"
<span>B maybe the correct answer, only because the last choice has a comma at the end and not a period. (but if you just made a typo while copying and its supposed to be a period, then that's the answer.)</span>
The subordinate clause in the sentence "The trouble was that he forgot where he put his keys" is a noun clause.
<span>A subordinate clause is a clause that is dependent on the main clause. It cannot stand alone. The subordinate clause in this sentence is: "The trouble was that". The main clause in this sentence is: "he forgot where he put his keys". From the above we can see that the main clause can stand on its own but the subordinate clause cannot stand on its own. </span>