for a long time scientists have suspected that life exists on other planets besides the earth, but until recently, they had very little evidence to support this theory. not long ago, some pieces of rock from outer space discovered in australia.
이 문장에서 discovered를 are discovered로 고쳐야한다는데 was discovered 아닌가요.. 내용상 과거수동태라야
할거같은데 답지에는 현재수동태로 되어있어서요..답변부탁드립니다!