What does “they” refer to? A. people B. ages C. sticks D. trees
Giải thích
Đáp án C
“they” được thay thế cho sticks trong vế trước: We do not know exactly when or how people first used fire. Perhaps, many ages ago, they found that sticks would burn
Đáp án C
“they” được thay thế cho sticks trong vế trước: We do not know exactly when or how people first used fire. Perhaps, many ages ago, they found that sticks would burn