Orbiting from 2.7 to 3.6 billion miles from the sun, ...

★ Adverb and Noun Clauses

Orbiting from 2.7 to 3.6 billion miles from the sun, …………………..

A. the astronomer Clyde Tombaugh discovered Pluto in 1930

B. Pluto was discovered by the astronomer Clyde Tombaugh in 1930

C. it was in 1930 that the astronomer Clyde Tombaugh discovered Pluto

D. the discovery of Pluto was made by Clyde Tombaugh in 1930

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……………….advertising is so widespread in the United States, it has had an enormous effect on American life.

A. Why

B. The reason

C. On account of

D. Since