— Why not ask Bob to join us in the school trip? — I can't tell if he's able to. He's always ______ with his work.

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1. — Why not ask Bob to join us in the school trip?
— I can't tell if he's able to. He's always ______ with his work.

A . careful B . familiar C . casual D . busy

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初中英语牛津译林版七年级下册Unit 8 Pets Grammar单元课时练习题（一）