Read the sentence. those were the happiest years that simone what form of the verb know correctly completes this sentence? have known had known had knew

Those were the happiest years that Simone had known.

Explanation:

The verb "were" shows that the years that made Simone happy have passed. For this reason, the next verb must also be in the past, so that there is concordance between all the grammar classes present in the sentence.  Based on this, the "have known" option should not be used, because it presents the verb tense in the present.

Among the "had known" and "had knew" options, "had known" is used because "know" represents the past participle, which is used with the help of the verb "to have" to express past actions.

because each is self-sufficient.  

the price of our current war is high; it costs money and it costs lives.

but it does not cost our pride. it does not cost the guilt that would arise from knowing that we did nothing to intervene while our neighboring nations fell to despotic leaders.

it does not cost the terror of knowing that our allies are unstable. it does not cost the fear that we, too, will be next to fall.

which sentence most accurately explains why the speaker's use of the parallel structure is effective in this passage?

a. it underscores that disagreement will not be tolerated and will be dealt with swiftly.

b. it makes the speaker seem like a decisive and capable leader.

c. it emphasizes reasons to fight and inspires listeners to aid the war effort.

d. it establishes the speaker's credibility by acknowledging the difficulties of war.