After her time in hospital Jenny's parents are afraid she has in her lessons.A. fallen b

问题补充：

After her time in hospital, Jennys parents are afraid she has in her lessons.

A. fallen behind

B. fallen down

C. fallen back

D. fallen off

答案：

(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。