10. Which of the following compounds gives a 1 H-NMR spectrum consisting of only two singlets?
(A) CH3OCH2CH2OCH2CH3
(B) CH3OCH2CH2CH2CH2OH
(C) CH3OC(CH3)2OCH3
(D) CH3OCH2CH(CH3)OCH3
(E) CH3CH2OCH2CH3

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統計： A(0), B(1), C(14), D(1), E(5) #1026895