21. Which of the following is NOT a minimal pair?
(A) pat/bat
(B) tough/bough
(C) either/ether
(D) peace/peas
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統計: A(18), B(236), C(101), D(109), E(0) #1996412
統計: A(18), B(236), C(101), D(109), E(0) #1996412