After we boarded the boat, it went on down the river, stopping to take people in.
A. more or less
B. now and then
C. sooner or later
D. up and down
网友回答
A. more or less
(答案→)B. now and then
C. sooner or later
D. up and down
解析：考查短语辨析。A“或多或少”；B“时而”；C“早晚”；D“上下”。句意“我们登船后，它沿河而下，时而停下来接人上船。”故选B。