单项选择题
A. has taken B. took C. was taking D. had taken
Both Tom and Mary （） the exam.A. has passedB. have past...
单项选择题Both Tom and Mary （） the exam.
A. has passed B. have past C. have passed D. had passed
We've done once but failed. We'll have to do it()time.A...
单项选择题We've done once but failed. We'll have to do it()time.
A. a second B. the second C. the twice D. twice
