22. Antibodies _____ by small, round cells called lymphocytes and plasma cells.
(A) to be made
(B) making
(C) made
(D) are made

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統計： A(0), B(4), C(11), D(20), E(0) #2327175

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抗體由名為淋巴細胞和漿細胞的小圓形細胞製...
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