题文
Robert is said abroad, but I don’t know what country he studied in.
| A．to have studied |
| B．to study |
| C．to be studying |
| D．to have been studying |
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Robert is said abroad, but I don’t know what country he studied in.
| A．to have studied |
| B．to study |
| C．to be studying |
| D．to have been studying |
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