कच्चिदेतच्छ्रुतं पार्थ त्वयैकाग्रेण चेतसा। कच्चिदज्ञानसंमोहः प्रनष्टस्ते धनञ्जय ॥

kachchid etach chhrutaṁ pārtha tvayaikāgreṇa chetasā kachchid ajñāna-sammohaḥ pranaṣhṭas te dhanañjaya

Hath this been heard, O son of Prithâ, with one-pointed mind? Has thy delusion, caused by unwisdom, been destroyed, O Dhananjaya?

In plain words: Krishna asks Arjuna, calling him "son of Pritha" and "Dhananjaya" (winner of wealth), whether he listened with full attention. He asks if Arjuna's confusion, caused by lack of understanding, is now gone.