英语语法选择题(请说明原因)
Itisnowclearthatnosuchcreaturesasvampireshaveseenandnone_____intheworld.
A.wasfoundB.arefoundC.havebeenfoundD.havebeenfoundout
改正:题目少了一个been,应该是Itisnowclearthatnosuchcreaturesasvampireshavebeenseenandnone_____intheworld.