Our customers would______it very much if the salesperson could give them clear directions to operate the machine.
【正确答案】 C
【答案解析】解析：本题考查形近动词辨析。appear，出现，似乎；apply，申请，应用；appreciate，欣赏，感激；anticipate，期望，预期。根据句意，appreciate最为恰当，故选C。