Chọn câu đúng nhất ứng với A (hoặc B, C, D) từ những từ gợi ý
It/ think/ / chemicals/ convey/ information/ brain.




A.It been thought that chemicals convey information to the brain.
B.It has been thought that chemicals convey information to the brain.
C.It has been thought chemicals convey information to the brain.
D.It has thought that chemicals convey information to the brain.

Các câu hỏi liên quan