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20、______ is known to all is that while driving drivers should keep an eye out for road signs, on which are words or symbols giving directions or other traffic instructions.

A. What      B. As        C. It         D. Which

20、A

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______ is known to all is that while driving drivers should keep an eye out for road signs, on which are words or symbols giving directions or other traffic instructions.

A. What      B. As        C. It         D. Which

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