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
613.答案是B;be true of…适用于。
614.答案是B;devote one’s time to doing sth.,而consider sth.to be of great value认为…很有价值。
