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

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.

Question 49: I left home. Then I realized how much my family meant to me.

            A. Not until I had left home did I realized how much my family meant to me.

            B. When having left home did I realized how much my family meant to me.

            C. After having left home did I realized how much my family meant to me.

            D. Before I realized how much my family meant to me did I leave home.

Question 50: It was the right solution. Therefore, we could prevent the disease from spreading.

            A. If the solution were right, we could prevent the disease from spreading.

            B. If it had been the right solution, we could have prevented the disease from spreading.

            C. If it hadn’t been for the right solution, we couldn’t have prevented the disease from spreading.

            D. Without the right solution, we could have prevented the disease from spreading.