英语连字符等问题______is quite enough.A.half hour B.hour C.An half h

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英语连字符等问题
______is quite enough.
A.half hour B.hour C.An half houe D.Half an hour
He finished university in ______
A.twenty B.twenties C.early twenties D.his early twenties
Every day he bagins to do his homework______
A.at ten past seven B.at seven pass ten
为什么这么选?
有没有four-year old 这种形式?
还有four years old和four-year-old有什么区别?
在给我讲讲连字符的作用?为什么有时连字符前加a/an

D.Half an hour修饰语排序问题,没有为什么,规定的
D.his early twenties二十刚出头,英语里需要个所有格.这里不是具体的20岁,如果是20岁应该是 at 20,at age 20,at the age of 20,at twenty years old
A.at ten past seven 也是固定用法
four years old = four-year-old
连字符只是表示连着的这几个词是个群组,或是语义群,没特殊含义,有的话也就是稍微强调一下.用时注意单复数即可.
通常连字符有下列用法：
1) 用于复合词.
2) 用于词缀（或组合语素）与词根（或词）之间.
3) 用以避免单词在语义或在语音上发生混淆或用于分离.
4) 用于两地名、两数字或两个时间之间,意为“至”.
5) 用于单词移行.

英语连字符等问题______is quite enough.A.half hour B.hour C.An half h they walked for.A,an hour B.half a hour C,half an hour 选哪个 He was here().A.half an hour before B.half hour ago C.half a half an hour or a half hour? a half hour还是half an hour? It's only( )by bus.A half an hours' B half an hour's C half a half of an hour an hour and half还是an hour and a half How long does it take?It takes ( )A.half an hour B.hour C.tw half an hour 和a half hour有什么区别? they will go back () A after half an hour B in half an hour The school is _____ A.half an hour B.half an hour's