_______gravity ,there would be life on moon.

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/04/29 14:43:39

_______gravity ,there would be life on moon.
选项:
a、There were
b、 If there was
c、 Were there
d、 If there had been
B是错的

选D,这是虚拟语气,后面用了would+动词原形,前面的if条件句就要用动词的过去式
　1、表示与现在事实相反的情况：
　　从句：If 主语+过去时(Be动词用were,非正式场合下可用was)
　　主句：主语+should/would/could/might+do
　2、表示与过去事实相反的情况
　　从句：If 主语+had+done
　　主句：主语+should/would/could/might+have done　
3、表示对将来情况的主观推测　　
　　主句：主语+should/would/could/might+do　
　　从句：①if+主语+were to do
　　②if+主语+should/would/could/might+do
　　③if+主语+did（动词过去式）/were

there ( )life on the moon. There ______ no life on the moon. There are no ____(life)on the moon why is there no life on the moon? 1.There ____ no life on the moon. There are no ____(life) things on the moon ___we know,there is no life on the moon. There would be no life ___ water. there is not any plant life on Moon 同义句there（）（）plant life o 显而易见,月球上没有生命.____ there is no life on the moon.翻同义句原句：It is said that there is no life on the moon. it is supposed that there is no life on the moon,is supposed