---Mr. Wang, I have trouble       the text.

 --- Remember       it three times at least.

1. A.
   to understand; reading
2. B.
   understanding; reading
3. C.
   understanding;to read
4. D.
   to understanding; to read

---Mr. Wang, I have trouble       the text.

--- Remember       it three times at least.

---Mr. Wang, I have trouble       the text.
--- Remember       it three times at least.

[　　]

---Mr Wang, I have trouble ________ the text.

   ---I’m sure you can, but remember ________ it at least three times.

A. to understand; reading                 

B. understanding; reading          

C. to understand; to read                  

D. understanding; to read

---Mr Wang, I have trouble ________ the text.  

---I’m sure you can, but remember ________ it at least three times.

1. A.
   to understand; reading
2. B.
   understanding; reading
3. C.
   to understand; to read
4. D.
   understanding; to read