After the meeting, he said a great deal of advice ____.were givenhas been givenhad been givenhave been givenwere being given

To complete the sentence correctly, we need to choose the appropriate tense that fits the context. The phrase "after the meeting" suggests that the advice was provided at a point in the past, and this sentence refers to that past event whose effects may extend into the present.

1. Analyzing Each Option:

   • were given: Past simple; implies the advice was given in the past, but does not connect well with the phrase "a great deal of advice."
   • has been given: Present perfect; suggests that the advice was given at some point in the past with relevance to the present, which fits appropriately.
   • had been given: Past perfect; indicates that the advice was given before another past event. This does not fit well since it doesn't relate directly to the meeting context as needed here.
   • have been given: Present perfect; usually requires a subject that is plural or a collective that can be treated as plural (like "advice" as an uncountable noun is singular), making this form incorrect.

2. Conclusion: Among the options, "has been given" is the only one that accurately represents that a significant amount of advice was provided and is relevant to the current context of the speaker reflecting on the meeting.

Final Answer

The correct phrase to use is: "After the meeting, he said a great deal of advice has been given."