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    16、Many introduced plants ______ be cultivated in special soils for some time before they are transplanted in the field, otherwise they won’t survive.

    A. must                    B. might              C. could                          D. would

    16、A 

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    Many introduced plants ______ be cultivated in special soils for some time before they are transplanted in the field, otherwise they won’t survive.

    A. must                    B. might              C. could                          D. would

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