Chaucer was a master of the heroic couplet which consists of two rhyming lines in iamb
A、the line has 6 feet, and an unstressed syllable is followed by a stressed syllable
B、the line has 6 feet, and a stressed syllable is followed by an unstressed syllable
C、the line has 5 feet, and an unstressed syllable is followed by a stressed syllable
D、the line has 5 feet, and a stressed syllable is followed by an unstressed syllable