He willtell you when _________(press)the buttonand when not to.
举一反三
- When did the man return to work since the last time he ill A: When he felt better. B: When he had to. C: When his wife told him to.
- When you finish _________ your questions , simply press the Enter key.
- I don’t know when he ________. When he _______ here, I’ll call you in a minute.
- 中国大学MOOC: I dont know when he ____. When he ____ here, Ill call you in a minute.
- Press the "off"( )when you leave the hospital. A: switch B: change C: alter D: turn