问题补充：
Mr. Li is a .He us how to swim.
A. teaches, teaches
B. teacher, teacher
C. teacher, teaches
D. tescher, teach
答案：
A. teaches, teaches
B. teacher, teacher
(答案→)C. teacher, teaches
D. tescher, teach
解析：C “李先生是一个老师，他教我们游泳。”根据句意可知，第一个空填teacher“教师”；因为he是第三人称，故谓语用单数，即teaches。故选C。
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