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.Three-fourths of the surface of the earth_________sea.
A.is B.are C.were D.has been
Three – fourths of the surface of the earth ______ sea. A. is B. are C.were D. has been
A．is
B．are
C．were
D．has been
Three-fourths of the surface of the earth＿＿＿sea．
A．is B．are C．were D．has been