— The boy is good at making model planes.

试题详情及答案解析: — The boy is good at making model planes.
—How clever! Did he learn by_____?
A. him B. them C. himself; 答案：C; 试题分析：句意：――这个男孩擅长做飞机模型。――真聪明，他是自学的吗？learn by oneself自学。结合句意，故选C
考点：考查代词的用法。