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。()