题干
— Excuse me, can I interview Mr. Miller this afternoon?
— A moment, please. Let me check ______?
A：if Mr. Miller will be free
B：when will Mr. Miller have time
C：if Mr. Miller had an appointment
D：when does Mr. Miller come back
答案(点此获取答案解析）
A
2O2，下列关于这种气体的说法正确的是（ ）