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
下列过程中,发生了化学变化的是( )
细菌按形态分类可分为____ 、____ 、____ 等不同形态.
—What's your __________ jobs?
—They are doctors.