Bob is busy with the report because the boss wants to read it tomorrow.(保持原句意思)Bob is ______ ______ the report because the boss wants to read it tomorrow.

问题描述:

Bob is busy with the report because the boss wants to read it tomorrow.(保持原句意思)
Bob is ______ ______ the report because the boss wants to read it tomorrow.

busy writing(或doing)

busy finishing/writing