对(∀x)(P(y)∧R(x,y))→(∃y)Q(y) 中的自由变元进行代替,则表示为: (∀x)(P(z)∧R(x,y))→(∃y)Q(y)。
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We're responsible______ guiding you all to the hotel.
A. to
B. for
C. in
D. of
I heard there is a weight______ .
A. require
B. requirement
C. required
D. requiring
We are volunteers______ by the Executive Board (执委会)
A. send
B. sending
C. sent
D. to send
I taught English ______drawing.
A. so as
B. as good as
C. as soon as
D. as well as