题干
--Where is Mary? I’d like to have a talk with her.
--She _______________the library. You can find her there.
--She _______________the library. You can find her there.
A：has been to
B：has gone to
C：has left
D：will leave
答案(点此获取答案解析）
B
2SO3为放热反应，对该反应的下列说法中正确的是
