求助英语介词15.my father is writing a letter___the desk. A.on B.by

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求助英语介词
15.my father is writing a letter___the desk.
A.on B.by C.at D.to
选什么呢?许多人选on,我觉得那不是成了信写在桌子上了吗?by不是也有旁边的意思吗?谁能给我详细解释下,或者找个正式的例句,告诉我地址.

这道题选择A.on
直译为:我爸爸正在桌子上写信.
"在...之上''当然要用on了.其他的选项说不通.
一楼说的at,确实有"在...旁边''的意思,但是这里是表示在上边写信,在桌子旁边是没法写字的,要多考虑一下语境.
我楼上说的by多用于表示方式,后边要加个表示工具的名词,一般不加desk这样的地点.eg:I go to school by bike.
但是楼主说的也不无道理,eg:He is walking by the lake.(他正在湖边散步)
有些地点前可以加by的,楼主以后多留心句子的意思,也就是语境的问题,不能一味考虑词法.
P.S.祝你英语越来越好,

求助英语介词15.my father is writing a letter___the desk. A.on B.by There ________some writing paper on my desk.A is B are C am There _______some writing paper on my desk.A is B are C am D my desk is ()the window?A.by B.under On my desk is a photo that my father took of __ when I was a 代词选择：On my desk there is a photo that my father took of 空 wh My book is on（）desk A,my B,the my C,a my This is () book.() is on the desk.A.my/his B.his/my C.mine/h there is a letter on the desk,it is( )my mother.A.from B.for 《五年高考》P3（代词14）：On my desk is a photo that my father took of 用介词填空（at in on by with）：My pen is __ the desk. whose is ＿pen on my desk?A.a B.an C .the D.不填