Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Trả lời câu hỏi dưới đây:As coal mines became deeper, the problems of draining water, bringing in fresh air, and ________to the surface increased.
Câu hỏi
Nhận biếtMark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Trả lời câu hỏi dưới đây:
As coal mines became deeper, the problems of draining water, bringing in fresh air, and ________to the surface increased.
Đáp án đúng: D
Lời giải của Luyện Tập 365
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