The small river in front of my house was dirty before,but it is clean now.填三个空:The small river in front of my house---------- ------------ -------------dirty before.

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Thesmallriverinfrontofmyhousewasdirtybefore,butitiscleannow.填三个空:Thesmallriverinfrontofmyhouse------

The small river in front of my house was dirty before,but it is clean now.填三个空:The small river in front of my house---------- ------------ -------------dirty before.
The small river in front of my house was dirty before,but it is clean now.
填三个空:The small river in front of my house---------- ------------ -------------dirty before.

The small river in front of my house was dirty before,but it is clean now.填三个空:The small river in front of my house---------- ------------ -------------dirty before.
used to be