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【題目】You ______ ask your teacher for help when you can't do well in your schoolwork.

A. should B. mustn't C. would D. couldn't

【答案】A

【解析】句意：當(dāng)你功課不好時(shí)，你應(yīng)該向你的老師尋求幫助。A. should應(yīng)該；B. mustn't禁止；C. would愿意；D. couldn't不能。結(jié)合語(yǔ)境可知，此處是表示建議而不是命令，故答案為A。

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