showed / have shown

[Sb70012]

94. When you ……… him around the garden, ask him in for tea.

a)have shown (Answer Key)
b)had shown
c)showed
d)were showing

Hello,
Why not “c” (showed)?

[Canadian45]

@Sb70012

94. When you ……… him around the garden, ask him in for tea.

a)have shown (Answer Key)
b)had shown
c)showed
d)were showing

Hello,
Why not “c” (showed)? [color=blue]Because “showed” is past tense and the main part of the sentence is present tense. “showed” doesn’t fit the sentence.