Which of the following sentences uses prepositions correctly?
a. kevin was relieved the meeting was over by noon.
b. where is my science textbook at?
c. maryann was glad to have her dentist appointment over with.
d. my mother is always asking me where i am going to!

What is implied in this sentence from mark twain's "the £1,000,000 bank-note"? i was puzzled, and wanted to discuss the matter a little further, but they didn't; so i took my leave, feeling hurt and insulted to be made the butt of what was apparently some kind of a practical joke, and yet obliged to put up with it, not being in circumstances to resent affronts from rich and strong folk.