练习册

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    5. rain -- rains

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    4. has --- had

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    3. had -- have

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    2. will -- is

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    1. won't -- doesn't

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    10. is -- was

    B级　 单项单句改错

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    9. gone -- been

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    8. 在months后加ago

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    7. 正确

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    6. 在waiting后加for

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