Choose the best an...

Câu hỏi: Choose the best answer amongA, B, C, D to complete each sentence below:
Lenses,_________,are used to correct imperfections in eyesight.

A.  are the forms of glasses and contact lenses

B.  in the form of glasses and contact lenses

C.  glasses and contact lenses which form

D. glasses and contact lenses may be formed