If you are weak ____ a subject, ______your teacher for advice can help.

A．to, askingB．in, ask
C．to, to askD．in, asking

B

解析試題分析：句意：如果你有一科弱，那就向老師尋求能幫助你的建議。In 在; 主句為祈使句時(shí)，If條件狀語(yǔ)從句用一般現(xiàn)在時(shí)，故選B.
考點(diǎn)：考查if條件狀語(yǔ)從句

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