Your advice was a great help to us, with
题型：选择题
问题：
Your advice was a great help to us, without which all our efforts .
A．wouldn’t pay off
B．hadn’t paid off
C．wouldn’t have paid off
D．didn’t pay off
Your advice was a great help to us, without which all our efforts .
A．wouldn’t pay off
B．hadn’t paid off
C．wouldn’t have paid off
D．didn’t pay off