After her time in hospital, Jenny’s parents are afraid she has ______ in her lessons.

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问题 After her time in hospital, Jenny’s parents are afraid she has ______ in her lessons.

选项 A、fallen behind
B、fallen down
C、fallen back
D、fallen off

答案A

解析 fall behind“落后”;fall down“掉下”;fall off“脱落”。
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