【题目】The audience were_______the performance of Lang Lang, a famous young pianist.
A.impressed by
B.impressed on
C.interesting in
D.expressed by

【答案】A
【解析】be impressed by“给某人留下深刻印象，为……所感动”，符合句意。B项介词搭配错误；C项应将interesting改为interested；D项中express“表达”，不符合句意。