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一道SAT语法问题Some plants use chemical signals that repel insects

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一道SAT语法问题
Some plants use chemical signals that repel insects,and also,these signals help to put neighboring plants on alert so they can mount their own defenses.
A.that repel
B.also,these
C.so they can
D.mount their own defenses
但是不知道原因,应该怎么改呢?
一道SAT语法问题Some plants use chemical signals that repel insects
also,these是要改的部分?这题目只能选B啊……前面一个句子后面一个句子中间用AND连接不是挺好的……其他的跟后面都连不成句子……
不过还是感觉有点怪怪的,SAT语法里面不是and和also不能一起用么……
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