Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:
Mr. Smith first met his partner in 2011
A. Mr. Smith has known his partner since 2011
B. Mr. Smith hasn’t known his partner before
C. Mr. Smith hasn’t met his partner for 6 years
D. Mr. Smith has met his partner for 6 years