13、A driver is asked to keep his safety belt ____ while ___ on the highway.

A. fastened ; driving     B. fastened; drive   C. fasten ;driving     D. fastening ;driving

13、 A

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A driver is asked to keep his safety belt ____ while ___ on the highway.

A. fastened ; driving     B. fastened; drive   C. fasten ;driving     D. fastening ;driving

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