问题
Mr. Smith joined in different activities in Beijing. Do you know ___________?— Since 5 years ago.
A:when he went there
B:how long he has stayed there
C:how soon he will come back
D:when he will come here
B:how long he has stayed there
C:how soon he will come back
D:when he will come here
正确答案是：
同类题型
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