Listen, who _________ in the room? ( )

Listen, who _________ in the room? ( )

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—Where _________ you just now? ( ) —I _________ in the playground.

—Where _________ you just now? ( ) —I _________ in the playground.

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物质由微观粒子构成,下列物质由离子构成的是

物质由微观粒子构成,下列物质由离子构成的是

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某品牌牙膏包装盒上部分说明的碳酸钙和水都属于() 

某品牌牙膏包装盒上部分说明的碳酸钙和水都属于()

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