活塞式压缩机排气温度高时应检查气阀和活塞环。
参考答案：错
—Hello! May I speak to Alice?
—Sorry, she _____ Shanghai. [ ]
A. have gone to
B. has been to
C. has been in
D. has gone to
写出下列字符含义。（）BOD（）A/O（）SV
