題目列表(包括答案和解析)
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
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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