.不知道应该选什么,还有为什么..8.The effectiveness of colonoscopy in detecting cancer _____ demonstrated time and again.(A)\x05are(B)\x05has been (C)\x05to be(D)\x05were
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![.不知道应该选什么,还有为什么..8.The effectiveness of colonoscopy in detecting cancer _____ demonstrated time and again.(A)\x05are(B)\x05has been (C)\x05to be(D)\x05were](/uploads/image/z/2730794-50-4.jpg?t=.%E4%B8%8D%E7%9F%A5%E9%81%93%E5%BA%94%E8%AF%A5%E9%80%89%E4%BB%80%E4%B9%88%2C%E8%BF%98%E6%9C%89%E4%B8%BA%E4%BB%80%E4%B9%88..8.The+effectiveness+of+colonoscopy+in+detecting+cancer+_____+demonstrated+time+and+again.%28A%29%5Cx05are%28B%29%5Cx05has+been+%28C%29%5Cx05to+be%28D%29%5Cx05were)
.不知道应该选什么,还有为什么..8.The effectiveness of colonoscopy in detecting cancer _____ demonstrated time and again.(A)\x05are(B)\x05has been (C)\x05to be(D)\x05were
.不知道应该选什么,还有为什么..
8.The effectiveness of colonoscopy in detecting cancer _____ demonstrated time and again.
(A)\x05are
(B)\x05has been
(C)\x05to be
(D)\x05were
.不知道应该选什么,还有为什么..8.The effectiveness of colonoscopy in detecting cancer _____ demonstrated time and again.(A)\x05are(B)\x05has been (C)\x05to be(D)\x05were
句子主语是effectiveness,所以谓语动词用单数,从选项来看,只能选B,
不知道是不是有单词打错,感觉不太通顺,
句意大概是:时间又一次证明了结肠镜检查在诊断癌症方面的效果
选B???
选B 结肠镜检查在发现癌症上的作用已经被一次有一次的证实了。