单句改错

1. It is only when he comes back can you leave.

2.  A child as he is,he knows a lot about computer games.

3. In he came when the bell rang.

4. So fast he ran that I couldn't follow him.

5. It was not until he told me did I know the news.

秘密工作和公升工作的关系是（）。

A.秘密工作与公开工作是相辅相成的

B.秘密工作需要公开工作进行掩护，秘密工作寓于公开工作之中

C.公开工作需要秘密工作作后盾，并为秘密工作创造条件

D.秘密工作与公开工作是矛盾的，不能同时兼顾