38. C
How long have you been like this ?是固定句型,意思是:你想这样多长时间了?
39. B
how often 是对频率提问用的
how soon 是对“in +时间段”提问用的
how long 意思是多久,对时间段提问
比如:How long will you stay here ? I will stay here for two days .
how long 还可以问 多长 How long is the road ?
39 B