They have a good knowledge of English but little____ they know about GermanA haveB didC hadD do我觉得应该选D,但怎么答案是B,想不通.是不是答案错了?

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They have a good knowledge of English but little____ they know about GermanA haveB didC hadD do我觉得应该选D,但怎么答案是B,想不通.是不是答案错了?

They have a good knowledge of English but little____ they know about GermanA haveB didC hadD do我觉得应该选D,但怎么答案是B,想不通.是不是答案错了?
They have a good knowledge of English but little____ they know about German
A have
B did
C had
D do
我觉得应该选D,但怎么答案是B,想不通.是不是答案错了?

They have a good knowledge of English but little____ they know about GermanA haveB didC hadD do我觉得应该选D,但怎么答案是B,想不通.是不是答案错了?
嗯 答案错了 我跟您一样想不通!

肯定是D。

DB都不对吧,因为do是助动词,陈述句中不用,作动词的话,在这里还依旧不对了。应该用had,因为前文有have,而且这里应该用过去式。