1.if a =4,b=5 ,what's the answer to the question "a+2ab+1=?请问这句中的 to是针对的意思吧,不是不
1.if a =4,b=5 ,what's the answer to the question "a+2ab+1=?请问这句中的 to是针对的意思吧,不是不
定式结构,
2.our school playground is ()
A fifty metres-long B fifty metre long C fifty metres long D fifty-metre long 选完后请回答：如果要用连字符表达那正确的表达应是：
3.in our class there are 20 girls ,and () are boys.
A other students B the other students C others students D the others studentss 另,and 在此句中怎样译?
4.Mr Smith comes from London,Now he is in China .he is a teacher .he teachers (）a middle school .
A on B in C at D from,选 完后请回答,in 和 at 的区别.
不定式指的是to+动词原形,如to do sth.；本句中to后面是名词,所以to是介词,意思是“（针）对...”此题从语法角度看选C、D均可.若需连字符,则选D.记住：数词和单位名词之间用连字符连起来是单位名词用单数.50-meter；...our school playground is() A fifty metres-longB fifty metre longCfifty metres longDfifty-metre long 您说选D也对，那为什么不是这样表达的fifty-metre -long,就像：Millie is an eleven-year-old girl.数词-名词-形容词这种结构一般用于名词前面，也就是说后面要接名词，Millie is an eleven-year-old girl.但Millie is eleven years old.或Millie is a girle of leven years.均可，但不能Millie is eleven-year-old.