I don’t know . A. how often he visits his grandparents B. how soon will he come back C. how many students are there in his class D. how long is the bridge 查看更多

 

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I don’t know               

A.how often he visits his grandparents       B.how soon will he come back

C.how many students are there in his class    D.how long is the bridge

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I don’t know ________.

[  ]

A.how often he visits his grandparents

B.how soon will he come back

C.how many students are there in his class

D.how long is the bridge

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