配件，特别是专用配件（）具备出出厂合格证明书才能使用。
A.一般情况下
B.特殊情况下
C.必须
参考答案：C
—Let's go to the cinema tonight.I'll pick you up at about 7∶00.
—All right________.Don't forget.[ ]
A. It depends
B. Don't mention it
C. That's settled
D. Take care
We often have _____________ lunch at 12: 00. [ ]
A. a
B. an
C. /
