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王老师:19139051760(拨打)
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第1题

56 [填空题,0.7分] Fill in the blanks with the appropriate form of the verb or verb phrase given:If it __________ (be not)
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第2题

55 [填空题,0.7分] Fill in the blanks with appropriate preposition:A lot of chemicals can be derived ________ coal.
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第3题

54 [填空题,0.7分] Fill in the blanks with appropriate preposition:The goods in this store are sold ________ fixed prices.
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第4题

53 [填空题,0.7分] Fill in the blanks with appropriate pronoun: The ladder __________ he has standing on began to slip.
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