TheyregardastheirdutytoprovidethebestservicefortheircustomersA)thisB)whatC)itD)that

Question

They regard _______ as their duty to provide the best service for their customers
A) this B) what C) it D) that

Answer 1

选C
it 做的是形式宾语,代指后面的不定式.
regard/think +it +n/adj.+to do sth.
regard+it +n/adj.+that 从句