57.

Answer and Explanation

Your Answer is

Correct Answer is C

Explanation

The previous content "I asked them to recommend a more scenic route at the beginning, but seeing their confused expressions, I knew they had succumbed to this expressway long ago", and the latter sentence "I began to learn to explore this expressway ", it can be seen that the preceding and following sentences are causal, so so is used, and the author's feelings are unwilling, so unhappy is used. Item C is correct.

Item A: graciously "gracefully" wrong.