Had=S. Past
to capture -infinitivo (after another verb)
examining- gerund (after prepositions)
Answer:
I think sentence no 4 will be the best answer
hope you like the answer.........
The answer is b because she didnt know that the annex was going to be raided
I believe the answer you are looking for is D. Earlier, Both explain when the first messages were left. Hope this helps!
-Lion