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____ he has limited technical knowledge,the old worker has a lot of experience.

A.Since                 B.Unless

C.As                     D.Although

________ he has limited technical knowledge, the old worker has a lot of experience.

A. Since　　　　　　 B. Unless　　　　　 C. As　　　　　　　 D. Although

 __     he has limited technical knowledge, the old worker has a lot of experience.

A. Since                  B. Unless                 C. As                      D. Although

         he has limited technical knowledge, the old worker has a lot of experience.

       A．Since                  B．Unless                 C．As                      D．Although

___________ he has limited technical knowledge, the old worker has a lot of experience.

         he has limited technical knowledge, the old worker hs a lot of experience.

A.Since           B.Unless            C.As               D.Althought