Many lifestyle patterns do such ___great harm to health 为什么不用“a” 不是有such a good time吗?

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Many lifestyle patterns do such ___great harm to health 为什么不用“a” 不是有such a good time吗?

Many lifestyle patterns do such ___great harm to health 为什么不用“a” 不是有such a good time吗?
Many lifestyle patterns do such ___great harm to health 为什么不用“a” 不是有such a good time吗?

Many lifestyle patterns do such ___great harm to health 为什么不用“a” 不是有such a good time吗?
such 后面跟不跟a ;关键看其后名词是否可数名词单数.

因为后面是harm 不能与不定冠词连用

do harm to ...有害于......