They have a good knowledge of English but little()they know about German.A:have B:did C:had D:do为什么选D选项,而不选其他选项的理由

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They have a good knowledge of English but little()they know about German.A:have B:did C:had D:do为什么选D选项,而不选其他选项的理由
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They have a good knowledge of English but little()they know about German.A:have B:did C:had D:do为什么选D选项,而不选其他选项的理由
They have a good knowledge of English but little()they know about German.
A:have B:did C:had D:do为什么选D选项,而不选其他选项的理由

They have a good knowledge of English but little()they know about German.A:have B:did C:had D:do为什么选D选项,而不选其他选项的理由
前半句提示应当用现在时态,所以BC排除,后面的动词用的是原型,所以A排除.

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应该选D吧,前面的have是一般现在时,因此后边也要用一般现在时。意思是他们英语方面知识非常丰富,但是他们对德语了解很少,

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