_______ SOME SCIENTISTS USE LASERS FOR MILITARY PURPOSES, SHE H...

Câu 98.

_______ some scientists use lasers for military purposes,

She hasn"t received a single letter from him _______

they both left school.

others use them in

medicine.

A. as

B. because

C. since

D. now that

A. When

B. While

C. Until

D. However