题干
---Why didn’t you go to yesterday’s meeting?
---I would have but I ______ too busy working on the important experiment.
---I would have but I ______ too busy working on the important experiment.
A：had bee
B：wa
C：were
D：am
答案(点此获取答案解析）
B
CH3OH（g）过程中的能量变化情况如图所示，曲线I和曲线II分别表示不使用催化剂和使用催化剂的两种情况。下列判断正确的是（ ）