---Tony, I have trouble ____ the text.
---Remember ___ it three times at least.
A. to understand, reading B. understanding, reading
C. understanding, to read D. to understand, to read
---Tony, I have trouble ____ the text.
---Remember ___ it three times at least.
A. to understand, reading B. understanding, reading
C. understanding, to read D. to understand, to read
C