They found 　　 difficult to communicate with the boy.（　　）A.it B.that C.this D.one

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that I found it difficult to answer I found it difficult to answer I found difficult to answer I found difficult to answer it

difficulty; finding difficulty; to find difficult; finding difficult; found

found it believing to be

to be found to find finding being found

that that it it this

difficult to get it difficult getting it difficult to get that difficult to get

difficult to get it difficult getting it difficult to get that difficult to get

it difficult it difficult was difficult it is difficult

difficult to get it difficult getting it difficult to get that difficult to get

Chinese difficult to learned Chinese difficult to learn it difficult to learn Chinese herself difficult to learn ChinesE.

are difficult has proved difficult is supposed difficult have been found difficult

it difficult to get on with it is difficult to get on with that difficult to get on with that is difficult to get on with

it was difficult for him for him it was difficult he found it difficult he found difficult

finding to find found to be found