I'm sorry to tell you that I________ on the play ground.
| A．forget your books | B．forgot your books behind |
| C．have left your books alone | D．left your books behind |
In the dark street，there wasn’t a single person she could turn for help．
| A．that | B．who | C．to whom | D．from whom |
The novel was completed in 1978， the economic system has seen great changes．
| A．when | B．during which | C．since then | D．since when |
I found him sitting in his chair，completelya magazine．
| A．absorbing | B．being absorbed in |
| C．absorbed in | D．absorbing in |
He felt _________ when he found a stranger _________ about at the gate of the police station.
| A．puzzling; hung | B．puzzled; hung |
| C．puzzling; hanging | D．puzzled; hanging |
____ since the night before, I felt very hungry.
| A．Having eaten anything | B．Not having eaten anything |
| C．I hadn’t eaten anything | D．Not eating anything |