We worried about he was in good health.A. whetherB. ifC. thatD. what

问题补充：

We worried about he was in good health.

A. whether

B. if

C. that

D. what

答案：

(答案→)A. whether

B. if

C. that

D. what

解析：我们担心他是否健康。介词的宾语从句只能用whether引导，不能用if。