It is necessary that parents should the responsibility of helping their children develop legal awareness.
A. take on
B. carry on
C. look on
D. keep on
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(答案→)A. take on
B. carry on
C. look on
D. keep on
解析：A 考察动词短语辨析。Take on承担，呈现；carry on继续，开展，参与；look on旁观，keep on继续。由语境可知，家长有必要承担起帮助孩子增强法律意识的责任。故A正确。