单项选择( )1.Metal______ making machines and many other things.A.used to B.is used for C.is used as D.is used to( )2.This CD-ROM can help you learn and have fun _______ .A.at times B.some time C.on time D.at the same time( )3.The package tour ___

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单项选择( )1.Metal______ making machines and many other things.A.used to B.is used for C.is used as D.is used to( )2.This CD-ROM can help you learn and have fun _______ .A.at times B.some time C.on time D.at the same time( )3.The package tour ___ 单项选择, 单项选择. 单项选择, 单项 选择 单项选择, 单项选择 单项选择 单项选择 单项选择 单项选择 单项选择, 单项选择, 单项选择, 单项选择 单项选择 单项选择 单项选择