单项选择题
The old lady was ______ to the young man who helped her...
单项选择题The old lady was ______ to the young man who helped her find her lost grandson.
Sliver is the best conductor of electricity, copper ___...
单项选择题Sliver is the best conductor of electricity, copper ______ it closely.
_____ of them knows about the plan because it was secre...
单项选择题_____ of them knows about the plan because it was secret.
