his father looked ______ at his son.because his son made great progress in his exama.happpy b.happily

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his father looked ______ at his son.because his son made great progress in his exam
a.happpy b.happily

b
因为look 看是动词,副词跟在动词后,修饰动词

his father looked ___b___ at his son. because his son made great progress in his exam

没分不干