À première vue, la question semble simple.

[Froggy]

The given French is “À première vue, la question semble simple”, and the English says “At first sight, the question seemed easy”.

While the blank to be filled in takes “simple”, so it doesn’t affect the question, the tense of “seemed” doesn’t match up with the tense of “semble”. I would use either “seems” or “semblait”.

[Kalzem]

Indeed, there is a mismatch with the translated tense. I would also use “semblait” here instead of “semble”