单项选择题
When（）the old block of flats（）?
A.did;being demolished B.did;demolish C.is;being demolished D.is;demolished
单项选择题 My father（）take me to work with him is when I was a child.
单项选择题 He goes to school by bike, and the（）takes half an hour.
单项选择题 John and Mary（）for years before they got married.
