Some research workers completely____all those facts as though they never existed

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Some research workers completely____all those facts as though they never existed .
A. ignore
B. leave
C. refuse
D. miss
正确资料：A
21.  An Olympic Marathon is 26 miles and 385 yards, approximately_______from Marathon to Athens.
A. distance
B. is the distance
C. the distance
D. the distance is
正确资料：C
22.  If you are walking away from a clock tower, you will hear the ticking of the clock fade to a point_______it cannot be heard.
A. which
B. what
C. where
D. how
正确资料：C