Have you any idea _______?A.that how we can improve the English level within 4 monthsB.that how can we improve the English level within 4 monthsC.how can we improve the English level within 4 monthsD.how we can improve the English level within 4 months
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D解析考查同位语从句。A，B多了连词，所以排除；且从句要用陈述语气，所以选D。