问题
选择题
Sun Tao has had a _______ English course, but he still doesn't know
A．six-month; how to spell this word
B．six months; how spell the word
C．six-months; how he should spell this word
D．six-month; how should he spell the word
答案
答案：A
six—month“六个月”，是由“数词+名词”构成的复合词，其中的名词不可用复数形式；后一空为“疑问词+动词不定式”作宾语。