.If you are weak_ a subject,working hard and asking a teacher for advice can help.A:at working hardB:in working hard ,选择哪一个,为什么,

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.Ifyouareweak_asubject,workinghardandaskingateacherforadvicecanhelp.A:atworkinghardB:inworkinghard,选

.If you are weak_ a subject,working hard and asking a teacher for advice can help.A:at working hardB:in working hard ,选择哪一个,为什么,
.If you are weak_ a subject,working hard and asking a teacher for advice can help.A:at working hard
B:in working hard ,选择哪一个,为什么,

.If you are weak_ a subject,working hard and asking a teacher for advice can help.A:at working hardB:in working hard ,选择哪一个,为什么,
be weak in
不擅长;在…方面不行
B