Up to now，the program________thousands of children who would otherwise have died.
A．would save B．saves
C．had saved D．has saved
—Who do you think ________the book here?
—It may be John.He was sitting here all the morning.
A．was leaving B．leaves
C．had left D．has left
Mum，you really need to have a rest！You ________in the kitchen ever since you came back home three hours ago.
A．had worked B．were working
C．have been working D．worked
I have called the station and they told me the next train for Dalian ________at 3∶10.
A．will leave B．left
C．has left D．leaves
Who do you think ________ for the accident?
A．to blame B．to be blamed
C．is to be blamed D．is to blame
—When did you move to Qionghai?
—In 2009.But I ________in Haikou for many years.
A．have worked B．would work
C．have been working D．worked
