________scores of times, but Derek still couldn’t understand how to use past participle in a concrete situation.
| A．Having explained | B．Having been explained |
| C．Though it was explained | D．It was explained |
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________scores of times, but Derek still couldn’t understand how to use past participle in a concrete situation.
| A．Having explained | B．Having been explained |
| C．Though it was explained | D．It was explained |
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