GWD-12-Q3:
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 答案是D，我选了A...不太明白画线句子前面的结构，是倒装了么~？ 谢谢啦~ | 
