—I have difficulty __________ the article.
—Remember __________ it three times at least.
| A．to understanding, reading | B．understanding, reading |
| C．understanding, to read | D．to understand, to read |
—I have difficulty __________ the article.
—Remember __________ it three times at least.
| A．to understanding, reading | B．understanding, reading |
| C．understanding, to read | D．to understand, to read |
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