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
Answer: B
正确答案D，我选的B,这里面were it for的用法是什么？和were it to 有什么区别？
Were it not for 相当于if条件从句
原句相当于 ：
if it were not for the fusion-powered heat and radiation that rush from its core, a star would collapse under its own weight
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