pen.fd(a).bk(a).rt(_____);

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I bought a pen yesterday.画a pen

Whatdidyoubuyyesterday?祝你更上一层楼,有不懂的可以再问哦再问：Thesebeautifulpresentsarehers同义句转换再答：Thesebeautifulpresen

this is a my pen

不对!应该说：Thisisapenofmine.Thisisoneofmypens.

Is this a your pen?

应该是isthisyourpen

Have you got a pen?

A及物动词后边不能只省略宾语.要么不省,要么连动词也省,只保留住动词

They usually write-----------a pen

with

please give me a pen -------.

towritewithwith表示伴随你写字要笔来“伴随”啊!不加上with句子就应该这样译：“请给我一支笔来写”写什么呢?写笔?在笔上写东东?明显不对拉

there is a pen.对划线部分a pen提问

Whatisthatoverthere?

write with a pen

用笔写

WRITE WITH A PEN OR

用钢笔或铅笔写

it is a pen?

Whatisthat?

that is a pen

那是一支钢笔.这个问题会不会太简单了?我总感觉是一个脑筋急转弯

she has a pen 对a pen 提问

WHatdoesshehave?

There is a pen in my pen.

ihaveapeninmybed

This a pen.that is a pen,什么

Thisapen.thatisapen,too.

It is _____. A.pen B.my a pen C.a my pen D.my pen

选DThisismypen.这是我的钢笔.

I need a pen 对 a pen 提问

whatdoyouneed?

He bought a pen.

Apenwasboughtbyhim.再问：Heboughtapen.同义句谢谢He-----再答：Hegotapen.

he has a pen

Doeshehaveapen?

in pen和with a pen

对,是writeinsomeink而writewithapen是固定用法,你记住就行了

数列系数求解有两个无限序列：{ak}与{bk}其中{bk}是已知的两序列的关系如下式：a(k)=[b(k)/8]+[(a

写了个程序算了下:当k=10时:x(1)=1/8x(2)=1/64x(3)=17/512x(4)=289/4096x(5)=817/32768x(6)=9793/262144x(7)=96849/20