All the studentsWere busy ___________ except Fred.A、readingB、to readC、readAbe

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问题 All the studentsWere busy ___________ except Fred.

选项 A、reading
B、to read
C、read

答案 A

解析 be busy doing sth忙于干某事。be busy后还可以接介词with，意思是忙于某事。

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