But if a treatment ________ delayed the disease by seven years were to be available, the number of sufferers would drop by 40% by the middle of the century.
A.where | B.when |
C.why | D.that |
推荐套卷
But if a treatment ________ delayed the disease by seven years were to be available, the number of sufferers would drop by 40% by the middle of the century.
A.where | B.when |
C.why | D.that |