因为oil是形容词 不能单独做谓语 要想作谓语必须是be oiled 意思是漆油、涂漆的意思
that后面引导的是表语从句 从句也必须成分完整 它缺少谓语 要补充谓语 所以用be oiled
it is necessary that this machine tool __ every day 为什么用be o
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