Bob does well in math__Susan is good at history.They often help each other.a when b while

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Bobdoeswellinmath__Susanisgoodathistory.Theyoftenhelpeachother.awhenbwhileBobdoeswellinmath__Susanis

Bob does well in math__Susan is good at history.They often help each other.a when b while
Bob does well in math__Susan is good at history.They often help each other.a when b while

Bob does well in math__Susan is good at history.They often help each other.a when b while
B
while 是连词,有“然而”的意思,本句就是.
“鲍勃数学学得好,而苏珊擅长历史.他们经常互相帮助”

选B,这里while做连词表示转折,意思是然而