题目内容
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
答案:A

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题目内容
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