After her time in hospital, Jenny's parents are afraid she has in her lessons.
A. fallen behind
B. fallen down
C. fallen back
D. fallen off
网友回答
(答案→)A. fallen behind
B. fallen down
C. fallen back
D. fallen off
解析：短语短语辨析。A落后；B摔倒，跌倒；C后退，撤退；D脱落，下降；句意：她住院以后，Jenny的父母亲担心在学习方面她已经落后于别人。故A正确。