Question

They dug at the spot where it was marked X ―which sentence is it compound, complex or both

Answer 1

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•Question- They dug at the spot where it was marked X

Answer >> It is Compound sentence.
Because It has only 2 phrase, That is -

1st phrase : They dug at the spot.
2nd phrase : It was marked X.

Joined by a Conjunction WHERE.

But in Complex sentence, There are three Phrases unlike Compound sentence.

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Answer 2

 
Compund-Complex sentence

Main Clause: They dug at the spot 

Main Clause: it was marked X

Subordinate Clause: where it was marked X

Suboridnate Clause: but didn't find anything

thus it's, both complex nd compound sentence