made matters worse was their son’s disease was worsening.A. It; thatB. That; thatC. What;

问题补充：

made matters worse was their son’s disease was worsening.

A. It; that

B. That; that

C. What; why

D. What; that

答案：

A. It; that

B. That; that

C. What; why

(答案→)D. What; that

解析： 略