用所给词适当形式填空.There _____(be) many changes in china since 1987.

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用所给词适当形式填空.There _____(be) many changes in china since 1987.

用所给词适当形式填空.There _____(be) many changes in china since 1987.
用所给词适当形式填空.There _____(be) many changes in china since 1987.

用所给词适当形式填空.There _____(be) many changes in china since 1987.
have been

are
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Will be

are