单项选择题

How is it ______ your roommate's request and your's are identical

A) that
B) so
C) if
D) what
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问答题
写信邀请你的朋友参加你的生日聚会。信的内容包括：1．告知对方聚会的具体时间、地点；2．到达聚会地点的行车路线以及便利的交通工具；3．要求对方就是否能参加聚会作回答。
单项选择题
This is one of the longest bridges that ______ on this river.
A) is ever built
B) has ever been built
C) was ever built
D) has ever built
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