When I take / washing in / I / be / horrified / discover/ it / covered / in dirty marks.
A.When I have taken the washing in, I was horrified to discover that it was covered in dirty marks.
B.When I took the washing in, I was horrified to discover that it covered in dirty marks.
C.When I took the washing in, I was horrified and discovered that it was covered in dirty marks.
D.When I took the washing in, I was horrified to discover that it was covered in dirty marks.

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