1、【题目】He fell asleep immediately last night; he must ________ (be) very tired.
答案：
have been
解析：
暂无解析
1、【题目】________(fail)severaltimes,theyneedsomeencouragement.
答案：
解析：
1、【题目】A great number of small power stations ________ (set up) in their county since liberation.
答案：
have been set up
解析：
暂无解析
1、【题目】Howlong________they________(dig)theditch?
答案：
解析：
1、【题目】“Haveyoumovedintothenewflat?”“Notyet.Therooms________(paint).”
答案：
解析：
1、【题目】Matteristhename________(give)toeverythingwhichhasweightandoccupiesspace.
答案：
解析：
1、【题目】Thedirectorrecommendedthatshe________(study)moreEnglishbeforegoingabroad.
答案：
解析：
1、【题目】heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
答案：
解析：
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