749.As our eating habits are changing,choosing what ______ is no longer as easy as it once was.
A.eat
B.eaten
C.to eat
D.to be eating
750.He got well-prepared for the job interview,for he couldn't risk the good opportunity _________.
A.to lose
B.losing
C.to be lost
D.being lost
749.答案是C;考查非谓语动词，此处what to eat为连接词+不定式结构,在句中作choose的宾语。
750.答案是D;考查非谓语动词。risk后接名词。
