22. What does the pronoun it in the first paragraph refer to?
(A) Brain tumor.
(B) Recent explanation.
(C) Savant syndrome.
(D) Complex calculation.
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統計: A(3), B(14), C(217), D(7), E(0) #888167
統計: A(3), B(14), C(217), D(7), E(0) #888167