---____ will he be back?
---In a week.　
A．How long B．How soon C．How often D．How many
B

試題分析：句意:-他多長時間才能回來？-一周以后。how long 多長時間，對一段時間提問；how soon 多久，多快，常跟一般將來時搭配；how often 多久一次，提問頻率；how many 多少，提問數(shù)量。根據(jù)這個對話中的答語可知，這里問的是多長時間后回來，故選B，表示一段時間之后。in 用在將來時中，后跟一段時間，表示一段時間之后。
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