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297.It is not rare in _______ that people in _____ fifties are going to university for further education.
A.1990s;the
B.the 1990s;/
C.1990s;their
D.the 1990s;their
298.Every few _____ along the Great Wall there are some watch towers.
A.hundred metres
B.hundreds metre
C.hundreds of metre
D.hundred of metres
