题目

Nobody except Tom and Millie _______ that park before . Only they can be our guides .    A. have been to   B. has been to   C. has gone to   D. have gone to 答案：B They argued for hours on _____ end until the meeting came to ______ end at last, reaching no agreement.    A. an; /          B. /; an            C. an; an       D. /;/