单选题：It took me a whole hour to solve the problem.

题目分类：卫生类
题目类型：单选题
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题目内容：

It took me a whole hour to solve the problem. A．A work at
B．B work on
C．C work out
D．D work over

参考答案：

答案解析：

During his lifetime he was able to accumulate quite a fortun

During his lifetime he was able to accumulate quite a fortune.A．A control B．B sp

分类：卫生类题型：单选题

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分类：卫生类题型：单选题

举例说明学前儿童前概念阶段的主要思维特点。

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分类：卫生类题型：单选题