单选题：Cement was seldom used in building the Middle Ages.

题目分类：卫生类
题目类型：单选题
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题目内容：

Cement was seldom used in building the Middle Ages. A．crudely
B．rarely
C．originally
D．occasionally

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答案解析：

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At present the number of bone marrow donors in mainland China is___________

分类：卫生类题型：单选题