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If you are weak ____ a subject, ______your teacher for advice can help.
A.to, askingB.in, ask
C.to, to askD.in, asking
B

试题分析:句意:如果你有一科弱,那就向老师寻求能帮助你的建议。In 在; 主句为祈使句时,If条件状语从句用一般现在时,故选B.
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