问题
选择题
It is an American custom when _____ friends to telephone ahead of time to tell them you are coming. [ ]
A. visit
B. visiting
C. to visit
D. visited
答案
答案：B
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It is an American custom when _____ friends to telephone ahead of time to tell them you are coming. [ ]
A. visit
B. visiting
C. to visit
D. visited
答案：B