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939.The Niagara Waterfalls,____ is shaped like a semicircle,are 670 meters wide,and fall 56 meters in an awesome white sheet of water.
A.what
B.where
C.the largest of which
D.in which
940.Mr.Smith,____ it so happened,was away on business that day.Maybe I should have phoned him before I came here.
A.what
B.who
C.that
D.as
