4. It is difficult to ____ the factors which contribute to the spread of the new virus. More extensive research is obviously required.
(A) distract
(B) dispatch
(C) disseminate
(D) disentangle
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統計: A(0), B(0), C(0), D(1), E(0) #3348544
統計: A(0), B(0), C(0), D(1), E(0) #3348544