The substance is very toxic. Protective clothing must be worn at all times.

A. Since the substance is very toxic, so protective clothing must be worn at all times.

B. So toxic is the substance that protective clothing must be worn at all times.

C. The substance is such toxic that protective clothing must be worn at all times.

D. The substance is too toxic to wear protective clothing at all times.

Bài tập Luyện thi vào lớp 10 - CHUYÊN ĐỀ 23: LIÊN TỪ (Mã 123.3)