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