Valmiki Ramayana Sundara Kanda Sarga 63 Shloka 17

ते they, यदा like that, वनम् garden, अभिपन्नाः entered, वानरैं कर्म their duty, साधितम् had done, देवी queen, दृष्टा saw, सन्देहः doubt, न no, अन्येन others, न not, हनुमता Hanuman.

"If they have trespassed into the garden that way, they might have done their duty. No doubt, Hanuman alone among them might have seen Sita.