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Test of English as a Foreign Language (TOEFL)
6. Mary has trouble _____.
1) to remember her homework
2) to remembering her homework
3) remember her homework
4) remembering her homework
Answer: 4
Hint:
An infinitive means the future in this context. "To" is not followed by -ing forms. Since "has" is the verb here, another verb is not used.
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