–_____ should your robot need repairing?

– Every six months.

A. How long B. How often C. When D. What time

B 【解析】句意：-你的機器人多久需要修理一次? —每六個月。A. How long多長時間或多長，詢問時間長度或物體的長度；B. How often多久一次，詢問頻率；C. When疑問副詞，什么時候，詢問時間；D. What time什么時間，詢問具體的點刻。根據(jù)答語Every six months，表示頻率。故選：B。
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