（）We don't know ______.A.how to do B.which to do C.what to

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（）We don't know ______.A.how to do B.which to do C.what to do D.where to do

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A与D中的HOW ,WHERE 都是疑问副词,不能作宾语,故排除,而B中的WHICH后应该有名词,也错

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（ ）We don't know ______.A.how to do B.which to do C.what to