she works hard _____ all her lessonsa.atb.aboutc.ofd.in

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sheworkshard_____allherlessonsa.atb.aboutc.ofd.insheworkshard_____allherlessonsa.atb.aboutc.ofd.insh

she works hard _____ all her lessonsa.atb.aboutc.ofd.in
she works hard _____ all her lessons
a.at
b.about
c.of
d.in

she works hard _____ all her lessonsa.atb.aboutc.ofd.in
a.at

当然D

似乎是选at,因为一般work hard in dong sth/at sth

A
works hard at all her lessons - 在每门课都下了功夫,很用功。