Les deux armées ________ longuement.
The two armies look at each other for a long time.
"se regardent" was marked as the answer and "se regardent pendant" as wrong. IK don't understand why both are not acceptable.
"longuement" (for a long time) is the adverb modifying the verb se regardent.
"Pendant" in this context would be a preposition and I suspect that is why it was not accepted.
Hope this helps.
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