This exercise only accepts "Je ne sais pas quoi dire" as translation, but I just wanted to confirm that "Je ne sais que dire" is also correct, or is there some difference in meaning between the two that excludes the latter?
Freeform Writing Exercise B1
No, there is no difference in meaning between the two expressions.
It is just a question of register -
Je ne sais que dire
is a more elevated language ( language soutenu)
than the more familiar -
je ne sais pas quoi dire
I have just seen that quoi must be used when it is followed by an infinitive.
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