When asked to explain he did to make his students so fascinated with his lessons, the tea

When asked to explain he did to make his students so fascinated with his lessons, the teacher paused and thought deeply.
A. what was it that
B. that what it was
C. what it was that
D. what was it

A. what was it thatB. that what it was(答案→)C. what it was that D. what was it解析：考查强调句的用法。由于强调句作explain的宾语，应使用陈述语序，故排除C、D两项；对比A、B两项可以发现这是强调句的特殊疑问句式，应把特殊疑问词置于句首，故排除B项。句意：当要他解释他是怎么做使得学生对他的课感兴趣的，老师停下来深深的思考。故C正确。

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