（）的工作时间是指从吸附开始到吸附转效点的时间。
参考答案：吸附器
___________ will you be free?[ ]
A. When
B. What
C. Where
D. Who
— I usually have my breakfast at 6:30 a. m.
— ________ . [ ]
A. So do I
B. So I have
C. So I do
D. So have I
