基本信息
21．She thought I was talking about her daughter, ______, in fact, I was talking about my own daughter.
A．when B．who C．which D．while
22．The sign reads "in case of _____fire, break the glass and push ____red button".
A．/ ; a B．/ ; the C．the ; the D．a; a
23．The comments which she made _______ marketing made her boss very happy.
A．being concerned B．concerned
C．concerning D．be concerned
24．They transplanted the little tree to the garden _______ it was the best time for it.
A．where B．when C．that D．until
