What qualities do you think are necessary and important for someone to become a genius?这句话的表达没有语法错误。
A. 对
B. 错
Companies understandably ask: why should I train you_______ you’ll leave and work for my competitors?
A.if
B.unless
C.until
D. although
After the bargaining progress_____, a final agreement was signed.
A.is completed
B. had been completed
C.has completed
D.had completed