They probably won't attend lecture tomorrow.
- A. The lecture probably not attended by them tomorrow.
- B. The lecture probably won't be attended by them.
- C. The lecture not probably attended by them tomorrow.
- D. The lecture probably won't been attended by them tomorrow.
Explanation
The passive of will not attend is will not be attended, with probably placed before the negative auxiliary. “Been attended” would require a perfect auxiliary such as has or have.
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