Children are ______ to meet with setbacks (挫折) as they grow up, so their parents don’t have to worry about it.A.possibleB.dueC.necessaryD.bound
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D解析考查形容词辨析。句意“孩子在成长的构成中肯定会遇到挫折，因此他们的父母不必担心。”A“可能的”；B“到期的，应得的”；C“必需的”；D“有义务的，受约束的”。be bound to do sth.“一定会做某事”。故选D。