Question

一道英语的完形填空

A circus moved from town to town,_________(put)on shows with________(train) animals,acrobats________(do)dificult tricks,and funny,colourful clowns.

正确的答案是putting trained doing

能告诉我为什么这么填吗，依据是什么？特别是第三个，不能填do吗？

Answer 1

trained animals 指受过训练的动物，putting,doing在句中是分词用作伴随状语，相当于A circus moved from town to town and put on shows with trained animals. Acrobats did dificult tricks,and funny,colourful clowns.第三个应该不能填do,如果用do的话，最后一句是一个句子，而acrobats前面却没有and连接，是错误的，用doing就只是充当整个长句的一个状语，是可以的。

Answer 2

putting, trained, doing

这些都是分词概念的语法，是对A circus moved from town to town 主句的补充说明，相当于：
A circus moved from town to town and put on show with animals that are trained , and arcrobot did ....

第三个是独立结构，doing的动作时acrobats 做的，当然用主动doing 了。

记住一个句子这有一个位于动词，这句虽然长，但谓语动词是move
，其他动词都要变成非谓语动词了

Answer 3

putting伴随状语，与circus是主动关系，用ving

trained 经过训练的作定语修饰animals,acrobats

with (rained animals,acrobats)（doing dificult tricks,and funny,colourful clowns.）with复合结构
with+名词+doing作状语