单项选择题
It is human nature to think back to a Golden Age（）one’s country was strong and respected.
A.when B.provided C.as D.unless
单项选择题 So forcefully（）that we were all convinced.
单项选择题 He has to make a living by himself because he doesn’t have parents to（）.
单项选择题 On Christmas Eve, we had several guests, who were（）friends of our daughter.
