已知∠A=40° 則∠A的補(bǔ)角等于A.50°B.90°C.140°

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    問題補(bǔ)充:單選題已知∠A=40°,則∠A的補(bǔ)角等于?
    A.50°
    B.90°
    C.140°
    D.180°
    答案:C