Many argue that the world will never make the switch to clea
Câu hỏi
Nhận biếtMany argue that the world will never make the switch to cleaner forms of energy __________ easily obtainable oil sources remain.
Đáp án đúng: D
Lời giải của Tự Học 365
Giải chi tiết:
A. giả sử
B. giả sử
C. nếu như không
D. miễn là
Luyện tập
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