宿舍里沒(méi)有燈光,他們必定是去聽(tīng)講座了,不是嗎?
這兒的反意疑問(wèn)句中must have done 是表推測(cè)判斷的,have作助動(dòng)詞,類似于do 的用法,故用haven't they.類比They cannot have gone to the lecture,have they?（否定的推測(cè)與判斷）
there is no light in the dormory(宿舍).They must have gone to the lecture,___?A.didn't they B.haven't they
there is no light in the dormory(宿舍).They must have gone to the lecture,___?A.didn't they B.haven't they
英語(yǔ)人氣：601 ℃時(shí)間：2019-08-20 15:46:57
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