英语翻译51、______ she seemed to find English very difficult,but

英语翻译
51、______ she seemed to find English very difficult,but later he made very good progress.D
A.At the first B.At present C.At the present D.At first
52、He likes to swim _______.A
A.and to play football B.and playing football
C.but play football D.and he also likes playing football
53、I couldn't find my English—Chinese dictionary _______.
A.anywhere B.everywhere C.nowhere D.somewhere
54、His example _______ that everyone can become a useful person in society so long as he is willing to work hard.C
A.expresses B.thinks C.indicates D.supplies
55、This train is going _______ the tunnel quickly.B
A.down B.through C.along D.in

D.At first 是起初的意思,固定搭配,中间没有the,选这个选项是跟后面的later（后来）相对应
At present也是固定搭配,是指现在、目前
-------------------------------------------------------------------------------------------------------------
He likes to swim and to play football.他喜欢游泳和踢足球.and是连词,连接前后成份一样,前面是to swim,后面也要跟着to do形式.如果前面是swimming,那就要选and playing football.like to do是想要做什么事情（很可能接下来会去做这件事情.）,like doing是一直喜欢做某件事,但接下来不一定会去做这件事.如果是完型填空,则要根据语境前后联系去作选择.
-------------------------------------------------------------------------------------------------------------
I couldn't find my English-Chinese dictionary anywhere.直译：我哪都找不到我的英汉词典.not...any表否定,相当于no.就是本句也可以说 Nowhere could I find my English-Chinese dictionary.somewhere用于肯定句,指某个地方.everywhere所有地方,很显示不适合这个语境.
-------------------------------------------------------------------------------------------------------------
His example indicates that everyone can become a useful person in society so long as he is willing to work hard.他这个例子证明：如果能像他一样肯努力工作,每个人都可以成为社会有用的人.
express：表示,表达,表白.我们可以说这个句子表达了一种什么样的想法,但不能说这个例子 表示/表达/表白 了一个怎样的现象.
-------------------------------------------------------------------------------------------------------------This train is going through the tunnel quickly.火车快速穿过隧道.
答案4个选项都是介词,用于表示方位改变的方向.
down是由上到下,一般可go up/down the street/hill/mountain 穿过这条街（街道可能有一定的高度差,up指从低处向高处走,down指从高处向低处走.up跟down相对应）
through是指通过、穿过,一般是指通过管状物,如管道、隧道（封顶的一段空间）
along沿着,可以说沿着小河走go along the river
in 指在某东西内部,没有具体指向.He's walking in the garden.他正在公园里散步.他没有走出公园,一直在公园里,但具体是什么方向则不明确.