【题目】I was greatly ________ at how he worked out the ________ problem in a creative way.
A.amazed; puzzled
B.amazing; puzzling
C.amazed; puzzling
D.amazing; puzzled

【答案】C
【解析】be amazed at对……感到惊异；puzzling令人迷惑的。句意：他很有创意地把这个令人困惑的难题解决了，我对此惊诧不已。故选C。