42.Research shows that cancer is not one disease and that it is dozens of them, each with different ___________ that make the fight diabolically difficult.
(A)inventions
(B)rhythms
(C)solutions
(D)mechanisms

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統計: A(4), B(6), C(24), D(37), E(0) #1576929

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#2180776
Research shows that ...
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#2321087

mechanism 結構// diabolically 惡魔般地,非常惱人地

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