Question

—Did you have any difficulty catching yesterday’s lecture?
—No. The professor spoke very clearly to make his speech easy _____

1. A.
   understood
2. B.
   understanding
3. C.
   to be understood
4. D.
   to understand

Answer 1

Ｄ
这题考查句型:make+宾语+adj+to do句型，这里的不定式是主动表示被动。句意是：教授说的很清楚使他的演讲很容易理解。选D。