Isn’t it time you _________ some serious work before the examination?

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问题 Isn’t it time you _________ some serious work before the examination?

选项 A、get down to
B、took up with
C、got off with
D、put down to

答案A

解析 选项A“着手做事,特别是一些费精力,难做的事”(get down to something/doing something: start doing something that is difficult or needs a lot of time of energy),
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