1.I wonder how long ago the accident___.
A.takes place B.have taken place C.had taken place D.took place
2.In our country both the old and the young___.
A.is being taken good care B.are being taken good care of
C.is being taken good care of D.are taking good care of
3.___his homework,he had to stay at home at the weekend.
A.Having not finished B.Not having finished C.Not had finished D.Had not finished