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请帮忙解释几道英语语法题

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请帮忙解释几道英语语法题
之前试过给出很高的悬赏分,导致我的积分的损失,所以这次我暂时给出的悬赏分为5分,但是如果答案另我满意,我会另外再加分.
1.The man has a special talent for art and is____D____of a musician.(为什么选D?)
A.anybody
B.anything
C.somebody
D.something
2.He changed his name,____D____that nobody would find out what he had done before.(为什么不能选A?)
A.having thought
B.to think
C.thinks
D.thinking
3.With everything she needed____A____,she went out of the shop,with her hands full of shopping bags.(为什么选A,不选B或C?)
A.bought
B.to buy
C.buying
D.buy
4.__B__ twice,the postman refused to deliver our letters unless we chained our dog.(为什么选B,不选A或D?)
A.Being bitten B.Bitten C.Having bitten D.To be bitten
5.It is very ____A____ of you to arrange an early meeting between your boss and our team.(这4个单词的区别?)
A.considerate B.considerable C.considering D.considered
1.be something=is very good
如,Nick's father is something of a musician.尼克的爸爸是个很棒的音乐家!
2.A having done是指现在分词的完成形式作状语,表示这动作在谓语所表示的动作之前发生,如
Having driven all day,we were rather tired.(having driven表示的"先时性的行为"),但在该句中,现在分词引导的句子作伴随状语,他改了名字的同时,认为没人能发现他以前做过什么.
例;-Mary sat by the window of the classroom,reading a book.
玛丽坐在教室的窗户旁,正在读一本书.
3.因为everything是先行词,而she needed在句子中作定语.
With everything(she needed) _bought__,she went out of the shop,with her hands full of shopping bags.
4.在句首作状语,现在分词表主动,过去分词表被动,不定式to do表将来,the postman 是被咬所以用bitten.
5.considerate 意思是 体贴的,体谅的,考虑周到的;为(他人)着想的
eg:We think that he is the most considerate person we have ever met.
我们认为他在我们碰到的人中间是最能体谅人的.
He is always considerate to old people.这里后面接介词to,也可以换成towards,与题目相符合.他对老人一向体贴入微.
It was very considerate of you to send me a postcard.
你想得真周到,寄给我明信片.
considerable意思是大量的
eg:It is a considerable sum of money.
那是一笔数量可观的钱.
The economy was a considerable issue in the campaign
后面必须接名词,而这里后面是介词,故排除.
considering prep.1.考虑到;就…而言;鉴于
adv.1.从各方面考虑,从通盘考虑
considered adj.考虑过的,被尊重的
considering 和considered 还可以看作是现在分词和过去分词