单项选择题
An old lady was living next door. I heard her（）as I passed her room last night.
A.is coughing B.coughing C.to be coughing D.to coug
单项选择题 —Hello. This is Pat Wilson here. May I have a word with Grace? —（）
单项选择题 A large number of people（）present at the sports meeting.
单项选择题 If the phone rings again, I（）it.
