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单项选择题
A.concept.
B.the real world.
C.the thought.
D.meaning.
单项选择题
A.break down the conversation.
B.display their lack of interest in the conversation.
C.give conversational implicatures.
D.confuse their intentions.
单项选择题
A.enough practice.
B.language acquisition device.
C.context.
D.sufficient input.