高等继续教育 / 专科英语II
正确率:100%
题型描述: 单选题
When _ _ _ _ _ _ this machine, you must read the instructions first.
A. using
B. to use
C. use
D. having used
When _ _ _ _ _ _ this machine, you must read the instructions first.
A. using
B. to use
C. use
D. having used
参考答案:
佳题速递: