题文
If Harry did not attend the conference last night, he________too much work to do.
| A．had to have had |
| B．had had |
| C．must have had |
| D．must have |
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If Harry did not attend the conference last night, he________too much work to do.
| A．had to have had |
| B．had had |
| C．must have had |
| D．must have |
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