37. Mr. and Mrs. Brown have three sons, _______, which often surprises people who assume at least one of them is already married.
(A) none of them are married
(B) of whom none are married
(C) none of whom is married
(D) and none of whom is married
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統計: A(7), B(0), C(12), D(6), E(0) #3477199
統計: A(7), B(0), C(12), D(6), E(0) #3477199