Complete sentences 1. was very helpful to Tanesha

The online chemistry class

Explanation:

The given is a 'sentence fragment' as it exemplifies a group of words which are unable to convey a complete sense. It is a fragment as it lacks a 'subject' which would lead the sentence. Thus, in order to make the fragment into a complete sentence, we would require a subject 'The online chemistry class' to accomplish the sense and make it grammatically and lexically coherent..

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i believe the answer is b. we