---Sorry, sir. I can't answer this question.
---Well, you are supposed ______ this part of history.
| A．reading | B．to be reading | C．to read | D．to have read. |
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---Sorry, sir. I can't answer this question.
---Well, you are supposed ______ this part of history.
| A．reading | B．to be reading | C．to read | D．to have read. |
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