下面这个句子,在 there be 之间插入了 are known to:There are known to be thousands of different species of beetles. 类似的好像还有:There was said to be a fire in that building last...
As is known to us all, _________ tiger is in _________ danger of becoming extinct.A. the, theB. 不填, 不填C. the, 不填D. a, 不填请问答案选哪个?其实答案是C。第二空不填冠词,我知道,因为 in da...