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    It _____ to take me more than two hours _____ my homework.


    1. A.
      use; to do
    2. B.
      used; do
    3. C.
      use; do
    4. D.
      used; to do
    D
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    Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!

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