求助PREP一道题~~~~~~~看不懂这题什么意思

rx_11

1 Were it not for the fusion-powered heat and radiation that rush from its core, instead its own weight would cause a star to collapse.

A   instead its own weight would cause a star to collapse

B   instead a star would have collapsed under its own weight

C   a star would have to be collapsing under its own weight

D   a star would collapse under its own weight

E   its own weight would have caused a star's collapse

correct answer

请问这题题干想说什么呀？什么叫Were it。。。？为什么要倒装呢？
这是个虚拟语气吗？为什么instead不要了？？跪求真相··

ozymendias

省略了if，所以倒装
虚拟语气的非真实条件句中若含有“were, had, should等词”，可以省略连词if，并把were等移到句首，构成倒装。
Were he here now, he would tell us what to do.

rx_11

thx

lcj2003kit

我倒是选的D。。。晓不得为什么~