单项选择题
I have some difficulty（）some of the words in English.
A、 pronounce B、 to pronounce C、 pronouncing D、 of pronouncing
单项选择题 I（）you that Mary's back yesterday but I forgot all about it.
单项选择题 I have never been to Rome. But that's the city（）
单项选择题 It was not until she arrived home（）remembered her appointment with her friend.
