“平王立，东迁于洛邑，辟（避）戎寇。平王之时，周室衰微，诸侯强并弱，齐、楚、秦、晋始大，政由方伯。”  ——《史记·周本纪》

阅读材料回答：

（1）春秋争霸局面出现的原因是什么？

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（2）春秋时期出现了哪些主要霸主？

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（3）你认为这些霸主能够称霸的共同原因是什么？

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_____ as the most excellent student in her university, as most classmates had expected, made her parents very happy.

A．Mary was chosen

B．Mary chosen

C．Mary being chosen

D．Mary’s being chosen