This problem is said _______ three times, but he still can’t understand it.
| A．to have been explaining | B．to have explained |
| C．having been explained | D．to have been explained |
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This problem is said _______ three times, but he still can’t understand it.
| A．to have been explaining | B．to have explained |
| C．having been explained | D．to have been explained |
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