A. in line B. in vain C. at length D. without fail 参考答案:B 答案解析:[解析] 介词短语辨析。A.in line排成一行,排队;B.in vain徒劳地,无益地;C.at length最后,终于; D.without fail必定,无疑。根据句意应选B。句意为:玛丽虽然
第19题: [单项选择]A. She just received information about the art festival. B. She will help the man find information. C. The man can easily find the information by himself. D. The man should go to the art library. 参考答案:B 答案解析:[解析] M: Excuse me,did this library have anything on the international arts festival coming up th