12. The psychologist ______ at the University of Oxford developed a new method to test animal
intelligence.
(A) that is study
(B) who had studied
(C) who was studied
(D) which studied
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統計: A(11), B(365), C(93), D(19), E(0) #2752382
統計: A(11), B(365), C(93), D(19), E(0) #2752382