What do you mean _____ saying “out of question”?
A．of
B．in
C．by
D．with
答案：C
The decorations were so lovely that they _____ in a short time.
A．sold out
B．has been sold out
C．were sold out
D．were selling out
根据氨合成催化剂还原时的床层温度可判断催化剂的还原程度。（）
