1.[]Parents have a legal duty to ensure that their children are provided with efficient education suitable to their age.A.impulse B.influence C.obligation D.sympathyABCD
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参考答案：C
参考解析：0bligation指法律上或道义上的义务或责任，例如：a legal obligation to serve in the armed forces服兵役的法律义务。impulse驱使，推动：the impulse of curiosity好奇心的驱使。influence影响；sympathy的意思是“同情心”。