If you want to book tickets for the 2012 Olympic Games, just call 60952012. It be simpler.
A. mustn't
B. won't
C. needn't
D. couldn't
网友回答
A. mustn't
B. won't
C. needn't
(答案→)D. couldn't
解析：考查情态动词用法。A禁止，千万不能；B不会；C不需要；D不可能；句意：如果你想订购2012年伦敦奥运会的票，请拨打60952012,不可能比这个更简单了，故D正确。