9. A silent period is a time when learners _________.
(A) process the language.
(B) study the language.
(C) do written work.
(D) read and write more.
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統計: A(23), B(2), C(3), D(3), E(0) #488724
統計: A(23), B(2), C(3), D(3), E(0) #488724