horse is _useful animal while tigers are danger

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______ horse is _______useful animal while tigers are dangerous ones.
A./ ,an B An ,a C.the ,an D a,a

D
再问：你看一下二楼的答案，能跟我解释一下吗~~
再答：这个可以用排除法 horse 和 useful 如果用不定冠词的话，都必须用a

______ horse is _______useful animal while tigers are danger tigers are ___ (danger)animal.they can kill people tigers are in danger Tigers are ____(danger) animals. ( )horse is ( )useful animal. 1.My favorite animal are tigers?2.My favorite animal is tige a horse is an animal 是animal in danger 还是animal is in danger 书上看到：A tiger is a dangerous animal.Tigers are dangerous.关于ti 翻译：Tigers are terrible animals,but a cat is a cute animal. Tigers are terrible animals,but a cat is a cute animal. My favourite animal is tigers. 对么?