—Did you have any difficulty catching yesterday's lecture?
—No. The professor spoke very clearly to make his speech easy __________.
| A．understood |
| B．understand |
| C．understanding |
| D．to understand |
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—Did you have any difficulty catching yesterday's lecture?
—No. The professor spoke very clearly to make his speech easy __________.
| A．understood |
| B．understand |
| C．understanding |
| D．to understand |
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