单项选择题
A．knows B．has known C．knew D．will know
（）this, they formed a shock team to help complete the w...
单项选择题（）this, they formed a shock team to help complete the work.
A．Hearing of B．Heard of C．Hear of D．Having been heard of
Mother does most of（）at home. A．clean B．cleaning C．to c...
单项选择题Mother does most of（）at home.
A．clean B．cleaning C．to clean D．the cleaning
