3.He is teaching in his hometown now, bu

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问题选择题

3. He is teaching in his hometown now, but he________ in a hospital for 10 years.

A．worked

B．has worked

C．had worked

D．has been working

答案

答案：A

A 他在医院工作十年相对现在来说是发生在过去的动作，应用一般过去时。

问答题简答题

用于材料分选的涡流导电仪为什么要选用不同的工作频率？

单项选择题

It is a market which sales value might be more than 10 billion yuan.()

A. a market with a sales value that might be

B. a market which might be sales value

C. a market with sale value might be

D. market with sales might be a value