I'm having trouble solving this chorale. I'm given the soprano voice, I have to fill in the contralto, tenor and bass voices and indicate each scale degree used. The chorale is in G-sharp minor, which modulates to B major; the C in the second measure is the common chord (iv in G-sharp minor, ii in B major), a C chord.

I have no trouble filling in the second measure (ii - V - I, duh), but I can't seem to come up with a coherent progression to arrive at the C chord. Any help?
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