(单选题)29: Scientists didn’t know much about lung cancer______. () A: before B: until recently C: long before D: in the past few years ...
(单选题)52: ______ you need help, please let me know at once.( ) A: While B: As C: Even if D: If ...
(单选题)9: An average student should know that he needs to spend more time______ so that ______ a top student. ( ) A: studying ... he is B: to study ... he is C: studying ... he will be D: to study ... he will be ...
(单选题)6: ( )I haven’t read the book, I know very little about it. A: After B: Although C: As D: Before ...
(单选题)19: We didn't know his telephone number, otherwise we____________him. A: would have telephoned B: must have telephoned C: would telephone D: had telephoned ...
(单选题)23: A student, ____________ name I don't know, came to see me. A: that B: who C: whose D: whom ...
(单选题)1: ____________the old man's sons wanted to know was ____________the gold had been hidden. A: That ... whatr B: What ... where C: What ... that D: That ... Where ...
(单选题)11: Robert is said to____________abroad, but I don't know what country he studied in. A: to have studied B: to study C: to be studying D: to have been studying ...
(单选题)10: I don't know whether you happen____________, but I am going to study in the U.S.A this September. A: to be heard B: to be hearing C: to hear D: to have heard ...
20.You won’t know whether the coat fits you until you ______ it on. A. will try B. have tried C. tried D. are trying ...