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1 The local health organization is reported ____ twenty- fiv

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1 The local health organization is reported ____ twenty- five years ago when Dr.Green became its first president.
A.to be set up B.to have been set up 答案给的是b,我觉得要选a
2.On saturday afternoon,Mrs.Green went to the market ,_____ some bananas and visited her cousin.
A.bought B.buying C.to buy 可能是要和后面的visited 对应吧,可是我不明白后面部分做什么成分呢,只有逗号没有连词可以连接这样的句子吗,不是应该用非谓语的吗
3.The detective finally discovered the lonely house,whose door was half-open,____ there for a while,and then entered it,only to find the man he was looking for already dead.
A.to stand B.standing C,stood
答案是选c,同上面一题一样,为什么没有连词却不用非谓语呢
4.Much new and high technology has been introduced from abroad,thus ___ in great increase in production of the firm.
A.resulting B.resulted
为什么选a 呢,有了thus 还要用非谓语吗
1 The local health organization is reported ____ twenty- fiv
1.关于动词不定式原形,他做若干成分时,任然带有动词的气息,也表达着时态,原形一般表达将来,要表过去或是完成的,只能用,他的完成时态,to have done,表现在的,就用进行时态,to be doing.回到原题,卫生组织是25前就成立了,已成事实,所以用完成态,再例,
he is said to have killed a man 10 years ago.此句的时间状语修饰不动态,和主谓语无关.he is rumored to swim across the strait in a few days.
2.这是几个谓语动词并列的现象,很常见的,还好你的句子他们都有各自的宾语,也有共有宾语的情况,这些动词的动作可能有先后顺序或是同时的(时态一般是一致的,主要是根据所要表达的意思确定了)--- 用and 连接,
也可用or 连接,表选择.
I was pitched,feathered and ridden along the street.= they pitched,feathered and rode me along the street.
do you want to pick up kids,do the cooking or buy some groceries?
3.c.and 是连词啊,他可以并列词性相同的任何
4.thus区区一个副词,身份不够,连词才可以同等并列的,