结合所学知识，判断下列文献产生的时间，排列正确的是： [ ]
① ② ③ ④
A．①③②④
B．①④②③
C．①②③④
D．①②④③
答案：D
She must be looking forward as much to his return as he himself is to________her. [ ]
A. see
B. have seen
C. seeing
D. be seeing
汽包壁温在何处读取？
