（-y+x-1）去括号以后，正确的形式为 [ ]
A．-y+x-1
B．y-x-1
C．y-x+1
D．y+x-1
答案：C
基督徒应当怎样对待父母？
The service economy doesn''t suggest that we convert our factories into laundries to survive.
A．imply
B．persuade
C．hurl
D．transform
