It has been very difficult getting to the bottom of some complicated problems.这句话是现在完成时还是现在完成进行时?

It is his ability that matters in the job,so_____doesn't make much differenceAwhether he has been abroadBwhether he has gone abroadCif he has been abroad Dif he has gone abroad Has been very quiet it has been very cold this year 为什么用been 启一个什么作用 Has Been Very quiet Give your love has been Very ()JOE has never been to china ,he is very intersted in it As everyone knows,English is very important today.It has been used everywhere in the world. It seems that has been to england because he speaks very good english是什么意思? It's been very informative it has been since.用法 It has been in my it is/has been= It's has been accepted it has long been assumed Mout Tai is very beautiful.It--------famours in the word now.A.has been B.was C.seem D.hasMout Tai is very beautiful.It--------famours in the word now.A.has been B.was C.seem D.has Has been very peaceful for yours love 看电影看字幕感觉有个字幕不对大家看看这些年你怎么样 how are you been 不应该是how have you been 还有it is been very nice 不应该是 it has been very nice Her car has been very dirty,she has got to _____.A.get washed B.wash C.get washed it D.get it washed为什么呢?求详解, Yellow of the evening,Tim has been very,very beautiful.