They are busy ______ in their lessons before the exam.

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问题 They are busy ______ in their lessons before the exam.

选项 A、going after
B、going over
C、going by
D、going ahead

答案B

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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