问题补充：
On Children’s Day, of the students was pleased because they each a present.
A. every one; was given
B. everyone; was given
C. every one; were given
D. everyone; were given
答案：
A. every one; was given
B. everyone; was given
(答案→)C. every one; were given
D. everyone; were given
解析：句意：在儿童节这一天，每个孩子都很高兴，因为他们每个人都给了一个礼物。everyone 指人，是代词，单独使用，不可以和of 连用。如想和of连用，则应使用 every one 。they 做主语，是复数。谓语动词用were。故选C。
