单选题
They are busy ______ in their lessons before the exam.
A、
going after
B、
going over
C、
going by
D、
going ahead
【正确答案】
B
【答案解析】
go after,“追求,追逐”;go by,“经过,顺便走访”;go ahead,“开始,前进”;go over,“复习,对……仔细检查”。
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