Circle the mistake from these underlined word (A,B,C or D). Nhanh giúp em với ạ 1. Milk(A) can(B) be use(C) for making(D) butter and cheese 2. We are(A) delighted(B) to get your(C) letter yesterday(D) 3. We are(A) looking(B) forward (C) to see you in June 4. This(A) question is(B) difficult(C) understanding(D)