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