dang cau hoi social exchanges trong cac de thi thpt lop 12, cac cau hoi duoc loc ra va co dap an di kem, bai tap co dang trac nghiem, multiple choice. dang cau hoi social exchanges trong cac de thi thpt lop 12, cac cau hoi duoc loc ra va co dap an di kem, bai tap co dang trac nghiem, multiple choice[r]