单项选择题

He ______ his examination if he worked harder.

[A] has passed
[B] should have passed
[C] could have passed
[D] would have passed
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单项选择题
When was Canada’s first national park completed [Al 1883 [B] lass. [C] 1886. [D] 1888.
When was Canada’s first national park completed
[Al 1883
[B] lass.
[C] 1886.
[D] 1888.
问答题
[题目要求]张伟的母亲因为车祸卧床。张伟的父亲张成将去天津出差，为此向学校刘老师请假，说明家中的情况，需要张伟在家二天照顾母亲。请写一张请假条，约100词，不要根据中文翻译写作文。
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