题干
—Excuse me! You can't take photos here．Look at the sign. It says “NO PHOTOS”．
— Sorry，I _________ see it and I _______ do it.
A：didn't; won't
B：don't; won't
C：won't; won't
D：don't; don't
答案(点此获取答案解析）
A
2SO3为放热反应，对该反应的下列说法中正确的是