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【单选题】
甲、签订了一份合同，约定由丙向甲履行债务，先丙履行债务的行为不符合合同约定，甲有权请求谁承担违约责任?()A.
请求丙承担违约责任
B.
请求乙承担违约责任
C.
请求共同承担违约责任
D.
请求乙或者丙承担违约责任
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A.
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B.
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C.
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D.
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