单项选择题

E-mail, as well as telephones, ______an important part in daily communication.

A．is playing
B．have played
C．are playing
D．play
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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
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
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