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Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendants, popularly known as killer bees, had migrated as far north as southern Texas.
I think the past perfect indicates that the migration took some time, maybe years. In this case present perfect would indicate that bees are still migrating. However, it sounds strange , but is still better than 'were migrating'!
I am confused between A and C, hMMMMMMMMMMMM which one?
Past perfect indicate that one action in the Past precedes the other one. Therefore it is simply wrong to use past perfect in both clauses. And this makes answer choice C grammatically wrong.
Personally, I do not understand the need for past perfect here at all...a bit confusing indeed. But since this part is not underlined we have no choice
Since we have past perfect "had migrated" in the the latter part of the sentence, wouldnt this mean that the other action referenced in the underline section "release" needs to be in the simple past? Isnt that the definition of past perfect that there are two events that occur in the past but one occurs before the other thus the use of "had" + simple past is applied to that action. But the the action that occurred after the past perfect action is in the past also, thus requiring at a minimum simple past verb form - "released" not the infinitive form "release"??
This completely confused me, and on this rule alone I narrowed down the choices to C/E "released" was in the past tense.
I see how C is wrong now because you cant have two past perfect verbs in a sentence..or can you? is that ever logical??
Can someone please clarify this rule?? And how A can be in the infinitive form and still be correct? Thanks!