Перепишите предложения, подчеркните сказуемое главного предложения и определите видо-временную форму и залог глагола. (например, was going – past continuous active от глагола to go). 1 botanical prospecting has been used in the search for deposits of ores. 2 men have been curious about the mysterious underwater world for centuries 3 scientists began serious research in this field only in our time.
have been - Present Perfect Active от глагола to be.
began - Past Simple Active от глагола to begin.