（）of the most important inventions of the time,the telephone
（）of the most important inventions of the time,the telephone helps people living in different countries keep in touch with each other.
A.Knowing to be one
B.It is known to be one
C.Known as one
D.As was known to be one
A.Knowing to be one
B.It is known to be one
C.Known as one
D.As was known to be one
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3x+4y+z=14;x+5y+2z=17;2x+2y-z=3
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