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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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
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
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