Answer:
moreover
Explanation:
A conjunctive adverb is a word that acts as a link between two independent clauses in a sentence. It can also come in between two main clauses, interrupting a single main clause. Examples of such conjunctive adverbs are although, therefore, then, moreover, although, etc.
In the given sentence, <em>"teleconferencing"</em> helped not only in establishing communication with the workers from their respective homes. It also "allows the participants to hear or see each other in a meeting". Thus, the best conjunctive adverb will be "moreover" as it adds to the already understandable sentence and links the two main clauses.
Thus, the correct answer is "moreover".
