Even our Mitsubishi four-wheel-drive truck gets altitude sickness
once in a while
, so we like to give her a rest whenever we can.
A、
sometimes
B、
usually
C、
often
D、
seldom
【正确答案】
A
【答案解析】
解析：sometimes“有时”；usually“通常"；often“经常”；seldom“很少”。划线单词once in a while“偶尔，时不时地”与sometimes词义相近，故本题选A。
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