Keys ________ used for ________ the doors．

[　　]

A．is, opening

B．is, opened

C．are, opening

D．are opened

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科目：初中英語 來源：人教新課標初三上冊練習 人教新課標 題型：014

Keys ________ used for ________ the doors.

[　　]

A. is, opening
B. is, opened
C. are, opening
D. are, opened

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科目：初中英語 來源： 題型：014

Keys ________ used for ________ the doors.

[　　]

A. is, opening
B. is, opened
C. are, opening
D. are, opened

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科目：初中英語 來源：同步題 題型：單選題

Keys ______ used for ______ the doors.
[     ]
A. is, opening　　　
B. is, opened　 　　
C. are, opening　 　　
D. are opened

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