Finding measures that can predict how a treatment will
work ___ in psychiatry compared with other branches of medicine.
(A) has difficult
(B) have difficult
(C) has been difficult
(D) have been difficult
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統計: A(58), B(28), C(267), D(46), E(0) #448207
統計: A(58), B(28), C(267), D(46), E(0) #448207