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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