The students are busy ______ (review) their lessons.reviewing本题考查动词短语的用法。考查的短语为：

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问题 The students are busy ______ (review) their lessons.

选项

答案 reviewing

解析本题考查动词短语的用法。考查的短语为：be busy doing sth．该句意为：学生们忙于复习功课。

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