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16、_______ how to operate the machine, the young man started it like a skilled worker.

A.Instructing                            B.Being instructed

C.Having instructed                D.Having been instructed

16、D

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_______ how to operate the machine, the young man started it like a skilled worker.

A.Instructing                            B.Being instructed

C.Having instructed                D.Having been instructed

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