Đề thi cuối kì 2 Tiếng Anh 10 Global Success có đáp án - Đề 9

These gases combine with the moisture in the atmosphere to (2) _______ sulfuric acid and nitric acid.

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These gases combine with the moisture in the atmosphere to (2) _______ sulfuric acid and nitric acid.

forms

form

formed

forming

Giải thích

Choose B