问题
选择题
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
答案
答案：B
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。