feruz77 wrote:
Mary received nine reports from her students after the midterm, using it to to help calculate the overall grades.
(A) Mary received nine reports from her students after the midterm, using it to help calculate
(B) Mary received nine reports from her students after the midterm, and used it to help in calculating
(C) Mary used the nine reports she received from her students after the midterm to help calculate
(D) Mary’s nine reports she received from her students after the midterm were used to help her in calculating
(E) Receiving nine reports from her students after the midterm, Mary used them to help calculate
In A "
it" is used to refer to the nine reports. That's wrong in S-V agreement terms- so A's out.
In B same thing here - B's out
In D, the
passive construction is unnecessary and therefore makes D incorrect. D's out.
In E, the way the sentence is constructed makes it sound like as if she is still receiving reports... which is not supposed to be the case. She's supposed to be able to calculate the grades after she has received the reports.
So C is your answer. "
To" is used appropriately to express purpose.