a problem helpMost of old houses ____in the last five years .A pulled down B have been pulled down C were pulled downKey:Dwhy ,I need grammar

a problem helpMost of old houses ____in the last five years .A pulled down B have been pulled down C were pulled downKey:Dwhy ,I need grammar A problem sbared is a problem balved是什么意思 帮忙翻译一下啊 O(∩_∩)O谢谢 this is a （ ) problem A biggest problem there is a problem more of a problem If each latter stants for a different number.Can you work out the math problem P O T A T O+ T O M A T O---------------S A L A D S He did ___until it was midnightA.a problem after a problem B.problem after prolemsC.a problem after problem D.problem after problem 英语翻译a problem sdve a problem work out its meating a solution to a problem 请问not a problem是什么意思 I must have a problem maybe..distance is a problem it is a problem that It is a important problem Address a problem with FFmpeg problem 是have problem with还是have a problem with 选出发音不同的 o A novel B problem C holiday D note u A rule B luck C hug D hurry急