题目内容

Keys used for the doors．

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

C
被用来做…… be used for doing，主语是keys谓语动词要用复数．

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Keys ________ used for ________ the doors．

A．is, opening

B．is, opened

C．are, opening

D．are opened

Keys ________ used for ________ the doors.

[　　]

C. are, opening

Keys ________ used for ________ the doors.

[　　]

C. are, opening

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Keys ______ used for ______ the doors.

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