Such electron tubes 是这句话的主语,as we use in a radio set 是一个修饰主语的从句,如果加了一个them,那么就多了一个代词,them in a radio set就成了一句独立的句子了,不符合语法.
我们用在收音机里的这种电子真空管,同样也可以在电视机里找到.
关于英语的选择题18.Such electron tubes _____b___ in a radio set are
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