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SAT语法题we now realize that the earth has limited resources wh

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SAT语法题
we now realize that the earth has limited resources which,【 if they are wasted,you put everyone in danger.】
a.which,if they are wasted,you put everyone in danger.
b.that we waste at our own peril
c.and it puts everyone in danger to waste them
d.and wasting ti will be perilous
e.and if you waste them it puts everyone in danger
请问为何c不行 it不是形式主语吗?
SAT语法题we now realize that the earth has limited resources wh
c不是it有问题,而是它前面少了引导词that.
We now realize that...and that...表示动词 realize 的宾语有两个,属于并列关系,其中第1个的引导词 that 可省略,但第2个的不能省略.
如果省略了第2个that,那就意味着it puts everyone in danger...和 we now realize...是并列关系,显然不符合事实.