Ankit73 wrote:
IMO, The answer should be D. The 'had' signifies an action in the past that was completed before another action in the past. Therefore, the simple past continuous tense 'Was listening' must be used.
Experts correct me if I am wrong.
Both A and D could be correct depending on what the author wants to convey.
A. This option means that Serge wondered about the members of audience who left ( the members, whohad listened to his speech before they left.)
D. This option means that Serge wondered about
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