They each other for 5 years.
A. have been in love with
B. have fallen in love with
C. are in love with
D. fell in love with
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(答案→)A. have been in love with
B. have fallen in love with
C. are in love with
D. fell in love with
解析：have been in love with sb.与某人相爱，表示状态，后面跟一段时间。fall in love with...后面不跟一段时间。