18. Roger Brown pointed out that most children acquired morphemes in approximately the same order. The first grammatical morpheme to develop is ________.
(A) –ing
(B) –able
(C) –ed
(D) –s

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統計: A(22), B(1), C(1), D(16), E(0) #3440127

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#6427874
Roger Brown指出,大多數兒童...
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Roger Brown’s resea...
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