问题补充:
---Will you walk a little faster?
---I was afraid you could not .
A. walk up
B. go up
C. keep up
D. catch up
答案:
A. walk up
B. go up
(答案→)C. keep up
D. catch up
解析:短语辨析。 A. 走上;等着 B. 增长;上升 C.保持;继续;不落后 D. 赶上。句意:你能走的快一点吗?——我恐怕你跟不上。catch up强调开始是落后的,从后面追上。keep up强调始终保持跟在后面,不掉队。结合语境可知选C。