Choose the word or phrase that best completes the sentence or substitutes for the underlined word or phrase.
..... important railroad tunnel in the US was cut through the Hoosac Mountains in Massachuset.
A. At first
B.It was the first
C.The first
D.As the first of
..... important railroad tunnel in the US was cut through the Hoosac Mountains in Massachuset.
A. At first
B.It was the first
C.The first
D.As the first of
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