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

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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