题目内容

一个完整的数据库系统包括4个部分：、用户、和硬件。

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He's still smiling____________he is in a lot of pain.

A. Because
B. however
C. even though

I want to help him,_______ l'm not sure I know how.

A. But
B. because
C. so

We are good friends,____________we live in different parts of the country.

A. So
B. although
C. however

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A. Because
B. Since
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