28. he sometimes makes mistakes.A. Though he is careful teacherB. As he is careful C. A

问题补充：

28. , he sometimes makes mistakes.

A. Though he is careful teacher

B. As he is careful

C. A careful teacher as he is

D. Being a careful teacher

答案：

A. Though he is careful teacher

B. As he is careful

(答案→)C. A careful teacher as he is

D. Being a careful teacher

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