单项选择题
A．am leaving B．will leave C．shall have left D．had left
We could not have fulfilled the task in time if it （） f...
单项选择题We could not have fulfilled the task in time if it （） for their help.
A．was not B．is not C．had not been D．has not been
Li Lei didn't meet the famous American professor （） he ...
单项选择题Li Lei didn't meet the famous American professor （） he was on holiday in America last year.
A．unless B．until C．if D．whether
So （） after she learned the good news that she could ha...
单项选择题So （） after she learned the good news that she could hardly fall asleep that night.
A．excited the mother was B．was the mother excited C．the mother was excited D．excited was the mother
