根据括号内的要求进行句型转换。

1. I don't know where I should go. (变为简单句)

    I don't know where ________ ________.

2. You could write him a letter. (变为一般疑问句)

    ________ I ________ him a letter?

3. He was playing computer games when I came in. (对划线部分提问)

     ________ he ________ when you came in?

4. "Where do you live, Tom?" Mr. Green asked.

    Mr. Green asked ________ where ________ lived.

5. I think she can speak Chinese and Japanese. (改为否定句)

    I _______ think she can speak Chinese _______ Japanese.

早期乳癌做保乳手术和放、化疗综合治疗的疗效与根治手术比()

A．疗效相同

B．前者比后者好

C．后者比前者好

D．结论不肯定

E．文献中无随机分组研究资料