"Not once has neighbour invited us into his house."

A Our neighbour has invited us in his house not once but many times

B Our neighbour has never invite us into his house

C Occasionally our neighbour has invited us into his house.

D Our neighbour has not always invited us into his house

Correct Answer: Option B

Negative adverb (যেমন not once) দ্বারা বাক্য শুরু হলে inversion হয় অর্থাৎ verb + subject হয় । Not once থাকায় বাক্যটির অর্থ negative হবে ।