an old worker, so he knew exactly what to do.A.BeingB.Having beenC.AsD.He was
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__ an old worker, so he knew exactly what to do.
A.Being
B.Having been
C.As
D.He was
试题答案
D

__ an old worker, so he knew exactly what to do.
A.Being
B.Having been
C.As
D.He was
D