题干
—What's your New Year's resolution, Dave?
—I'm going to exercise more _______.
A：keep fit
B：keeping fit
C：to keep fit
D：keeps fit
答案(点此获取答案解析）
C
—What's your New Year's resolution, Dave?
—I'm going to exercise more _______.
A：keep fit
B：keeping fit
C：to keep fit
D：keeps fit
癌细胞的叙述，不正确的是