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【单选题】
This is the key card ____ room 5012.这是5012房间的。A.
in
B.
to
C.
on
D.
at
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反馈参考答案：
举一反三
【单选题】以下哪个选项是错误的？
A.
" x " yA(x,y) Þ " y " xA(x,y)
B.
" x " yA(x,y) Þ $ y " xA(x,y)
C.
" x $ yA(x,y) Þ $ y " xA(x,y)
D.
$ y " xA(x, y) Þ " x $ yA(x ,y)
【单选题】Keys should never be hidden around the house since thieves ______know where to look.
A.
invariably
B.
virtually
C.
variously
D.
unavoidably
【单选题】Keys should never be hidden around the house since thieves ______ know where to look.
A.
virtually
B.
initially
C.
invariably
D.
infinitely
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