Question

be busily doing

be busily doing
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The library's study room is full of students_____for the exam.
a busily preparing
b busy preparing 选哪个？选b的话students后没有be动词呀？是不是省略了
who are为什么可以省略？不是关系代词在从句中作宾语时才可以省略吗

Answer 1

选b
可以理解为省略了 who are。其实可以看做形容词短语作定语。