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【单选题】
经典途径激活补体的抗原抗体复合物
A.
1个IgC与抗原组成的复合物
B.
1个IgM与抗原组成的复合物
C.
sIgA与抗原组成的复合物
D.
1个IgE与抗原组成的复合物
E.
2个密切相邻的IgG4与抗原组成的复合物
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