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 这道题目选什么呢,能不能解释一下,答案给的是b,我觉得要选a 啊
2. On saturday afternoon, Mrs.Green went to the market , _____ some bananas and visited her cousin.
A. bought B. buying C. to buy 这道答案是a,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
麻烦各位帮下忙吧,谢谢了