MY SISTER IS OFTEN SICK BECAUSE SHE DOESN’T DO PHYSICAL EXERCISE.A...

28. My sister is often sick because she doesn’t do physical exercise.

A. If my sister isn’t physical exercise, she does sick.

B. If my sister wasn’t physical exercise, she would do sick.

C. If my sister does physical exercise, she won’t often be sick.

D. If my sister did physical exercise, she wouldn’t often be sick.

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.