Mary is not used . . . . . . . . staying in a big city. A. to B. in C. on D. for

to
in
on
for

The correct answer is A. to.

Mary is not used to staying in a big city. This means that

she is not accustomed to it, and it is not something that she does often. She may find it difficult to adjust to the noise, the crowds, and the fast pace of life in a big city.

The other options are not correct because they do not make sense in the context of the sentence.

  • Option B, in, is incorrect because it does not make sense to say that Mary is not used in staying in a big city.
  • Option C, on, is incorrect because it does not make sense to say that Mary is not used on staying in a big city.
  • Option D, for, is incorrect because it does not make sense to say that Mary is not used for staying in a big city.

I hope this helps!