— Mr. Lee to a student when I entered the classroom this morning.
-- He is very patient he is young.
A. talking; but
B. talks; though
C. was talking, though
D. talked, however
网友回答
A. talking; but
B. talks; though
(答案→)C. was talking, though
D. talked, however
解析：but但是；though虽然，尽管；however然而，可是。句意：今天上午当我进入教室时，李老师正在对一个学生谈话。——尽管他年轻，但是他非常有耐心。结合语境可知上文描述的是过去某时正在进行的动作，故用过去进行时态，主语Mr. Lee是单数第三人称，故助动词用was。结合语境可知选C。