Topic: Inversion of Verbs,

Best Answer Explained in Below-:

The statement "Not once has our neighbor invited us into his house" clearly emphasizes the absence of any invitations from the neighbor. The phrase "not once" indicates that there have been zero occasions where an invitation was extended. This directly translates to the assertion that the neighbor has never invited the speaker into his home, making option B—"Our neighbor has never invited us into his house"—the most accurate interpretation of the statement.

The other options present contradictory scenarios. Option A suggests that the neighbor has invited the speaker many times, which directly opposes the initial statement. Option C implies that invitations have occurred occasionally, also contradicting the notion of "not once." Option D states that the neighbor has not always invited the speaker but leaves the possibility of some invitations occurring. However, the phrase "not once" eliminates any such variability.

In summary, option B encapsulates the essence of the original statement, accurately reflecting that there has been a total absence of invitations from the neighbor, thus making it the correct choice.