1.Only when he had finished his homework __ go outside to pl

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1.Only when he had finished his homework __ go outside to play with his fellow.
A he was able to B was he able to
2.Jone finally got his answer to the qustion __a series of experiments.(base on)为何不用现在分词,不是主动吗?
3.We are brave to have faced the difficulty;otherwise,the situation ___totally different now.
A will be B will have been C would be D would have been
4.__the environment is becoming more seriously polluted these years is __has worried many people.
A what ；that Bwhich ;what C that ;what D that ;that
5.__everything ready for the school sports meet,it began to rain heavily.
A getting B having got C when I have got D when I had got 为什么是两句话而不是一句呢?不是需要连词才能构成两句吗?
请说明选择理由及做题思路，

一B,从句only提前,主句倒装.二based on,因为be based on.三题虚拟语气,句子中有now,事实与现在相反选D.四C,前空用that指代整个事件,后是一个名词性从句,what在从句中做主语.五D,两句主语不同须有连词引导

1.Only when he had finished his homework __ go outside to pl 高中英语题1.Only when he had finished his homework ___ go outside Only when he has finished his homework he is able to play ,如 I __ he had finished his homework at this time when he finished his homework英语提问? he went home ( ) he had finished his homework.A.when B.while He didn't go to bed until he finished his homework.从句中的he可以省 I did not go to bed until my son had finished his homework.这 He had finished his homework before he watched TV "He didn't go to bed until he finished his homework "的同义句 @转换:He didn't go to bed until he finished his homework last not having finished his homework,he had to having lived in h