针对重大疾病出现了一系列疗法，譬如针灸，灸术，按摩，拔火罐，气功，或者是用中草药结合加以食物辅助都很有效。
Afteremergencytreatmentofacuteanddangerousdiseases,acupuncture,moxibustion,massage,cupping,qigongandacombinedtreatmentofmedicinalplantsanddiet______provedtobeveryhelpful.
请问句中横线部分应该填 have 还是 are，为何？
Afteremergencytreatmentofacuteanddangerousdiseases,acupuncture,moxibustion,massage,cupping,qigongandacombinedtreatmentofmedicinalplantsanddiethave
provedtobeveryhelpful.
prove 用作系动词，表示“证明是，结果是，发现为，显示为”，无被动语态。句型是：prove to be + adj. 其中to be可以省略。用完成时可以，但不可用被动语态（are proved）。比如：
These policies have proved to be highly conducive to economic growth.
这类政策日后证实是很有益于经济的成长
It has proved to be a good method.
这结果是最好的方法。
Contrary to what I thought, he has proved to be successful.
和我想的相反，他竟成功了。
The plan fell down because it proved to be too expensive.
这项计划因成本过高而告吹。
On closer examination, the painting proved to be a fake.
再经注意观察，证实那幅画是膺品。
The new typist proved to be useless.
这位新打字员证明是不合格的。
