Đáp án C
A. despite + N/V-ing: mặc dù.
B. nevertheless + S V O = D. however + S V O: tuy nhiên.
C. although + S V O: mặc dù.
Tạm dịch: Nguồn gốc của cờ vua hiện chưa được xác minh rõ ràng, mặc dù có một số truyền thuyết liên quan tới sự phát minh ra nó
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