We want to know       he will come back, as we are worried about his safety.
A．how oftenB．how soonC．how muchD．how long
B

試題分析：how often多久一次；how soon多久；how much多少錢；how long多長。句意：我們想知道他還有多久回來，我們很擔(dān)心他的安全。結(jié)合語境可知選B。
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