Choose the model

Question

Select the best choice that has similar meaning to the following sentence:

I did not understand what the lecturer was saying because I had not read his book.

Accepted Answer

I would have understood what the lecturer was saying if I had read his book.

Answer

What the lecturer wrote and said was too difficult for me to understand.

Answer

I found it very difficult to understand what the lecturer said in his book.

Answer

The lecturer’s book which I had not read was difficult to understand.