Lily does her homework as carefully as Linda

Lily does her homework as carefully as Linda

题目
Lily does her homework as carefully as Linda
我想知道,到底结尾处要不要加上does,来对应前面的动词does
还有比如,He runs as fast as Tom (does),这里是否也要does来对应前面的run呢?
答案
可加可不加.你很仔细.
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