______is believed to be a major source of incorrect forms resistant to further instruction

______is believed to be a major source of incorrect forms resistant to further instruction.

A．The second language learners" unwillingness to learn

B．The poor classroom teaching

C．The fossilization of the learners" interlanguage

D．The learner"s lack of instrumental motivation

请帮忙给出正确答案和分析，谢谢！

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