1.All flights_____because of the storm,they decided to take the train.A.having been cancelled B.have been cancelled 为什么选A?不能选B?2._____that there are no objection,we will begin with item three on the agenda.A.If B.Provided为什么选B,

1.All flights_____because of the storm,they decided to take the train.A.having been cancelled B.have been cancelled 为什么选A?不能选B?2._____that there are no objection,we will begin with item three on the agenda.A.If B.Provided为什么选B,
1.All flights_____because of the storm,they decided to take the train.
A.having been cancelled B.have been cancelled
为什么选A?不能选B?
2._____that there are no objection,we will begin with item three on the agenda.
A.If B.Provided
为什么选B,不能选A?
3._______is the center of our planetary system was a difficult concept to grasp in the Middle Ages.
A.That the sun and not the earth B.It is the sun and not the earth
为什么选A?不能选B?
4.I______to go to their party but I was not invited.
A.should have liked B.would like
第4题为什么选A？不能选B？

1.All flights_____because of the storm,they decided to take the train.A.having been cancelled B.have been cancelled 为什么选A?不能选B?2._____that there are no objection,we will begin with item three on the agenda.A.If B.Provided为什么选B,
1.,号不能连接俩个句子,所以第一个句子要用独立主格,也就是说要非谓语.
2.虚拟语气省略if
3.主语从句,that无实际意义,选B有俩个is,句子残缺.
4.should have done 本可以却未...意思是我本可以参加她们的聚会,但是我没有被邀请.B的意思是我愿意,不是所考知识点.

1。All flights_____because of the storm, they decided to take the train.
A.having been cancelled B.have been cancelled
为什么选A？不能选B？
这是一个表示原因的独立主格结构。
这句话里，没有连词，逗号后面的句子已经是完整的句子了，所以逗号前面的...

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1。All flights_____because of the storm, they decided to take the train.
A.having been cancelled B.have been cancelled
为什么选A？不能选B？
这是一个表示原因的独立主格结构。
这句话里，没有连词，逗号后面的句子已经是完整的句子了，所以逗号前面的不可能是一个完整的句子，所以用了一个独立主格。
2._____that there are no objection,we will begin with item three on the agenda.
A.If B.Provided
为什么选B,不能选A？
如果选A，那么后面不该出现that.
Provided that + 句子 = 倘若……
3。_______is the center of our planetary system was a difficult concept to grasp in the Middle Ages.
A.That the sun and not the earth B.It is the sun and not the earth
为什么选A？不能选B？
主语从句。句首的“That”是个连词，并且不能省略。
如果选B，那么在It is the sun and not the earth的后面还要加一个that，成为强调句，若不加that就是病句。
4.I______to go to their party but I was not invited.
A.should have liked B.would like
选B，would like to do sth固定搭配，意思是想做某事
我想去参加聚会的，但是我没被邀请。

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