单项选择题

The old couple have been married for 40 years and never once ______with each other.

A．they had quarreled
B．they have quarreled
C．have they quarreled
D．had they quarreled
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单项选择题
It was an excting moment for these football fans this year，______for the first time in years their team won the World Cup．
A．that
B．while
C．which
D．when
单项选择题
Only when your identity has been checked,______.
A．you are allowed in
B．you will be allowed in
C．will you allow in
D．will you be allowed in
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