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613.We should be careful in our studies.This is _______ everyone as carelessness causes mistakes.
A.because of
B.true of
C.up to
D.related to
614.The time he has devoted in the past years ______ the disable is now considered _____ of great value.
A.to help;being
B.to helping;to be
C.to help;to be
D.helping;being
