Bộ 20 đề luyện thi Chuyên Anh năm 2023 có đáp án (Đề 91)

If a diamond is heated without oxygen, it will turn to graphite, a form of that it is used as a lubricant. A. carbon is so soft     B. is carbon so soft     C. carbon so soft   D. so soft th

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If a diamond is heated without oxygen, it will turn to graphite, a form of _____ that it is used as a lubricant.

carbon is so soft

is carbon so soft

carbon so soft

so soft the carbon

Giải thích

Đáp án: C