this was done是什么時態

　　雙語例句

　　1、The work was done with the minimum amount of effort.

　　做這項工作沒費什么勁。

　　2、The work was done according to her instructions.

　　這項工作是依照她的指示辦的。

　　3、It was done without the principal's authority.

　　做這件事未經校長批準。

　　4、None of the work was done.

　　那些工作全都未干。

　　5、What beats me is how it was done so quickly.

　　使我困惑不解的是，這事怎么這么快就完成了。