It is hoped that all present-day communicable dise...

Câu hỏi: It is hoped that all present-day communicable diseases will be conquered. However, ________ about certain diseases is still not sufficient to prevent them from spreading easily among the population.

A what we know     

B what do we know

C what we know that   

D that we know what

Câu hỏi trên thuộc đề trắc nghiệm

- Mệnh đề danh ngữ - Có lời giải chi tiết