2. 外语
  3. I _____ the plumber as I learnt later that John had already phoned him.

I _____ the plumber as I learnt later that John had already phoned him.

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问题 I _____ the plumber as I learnt later that John had already phoned him.
选项 A、needn’t phone
B、needn’t have phoned
C、shouldn’t phone
D、shouldn’t have phoned
答案B
解析 考查情态动词的用法。“needn’t have+过去分词”表示“本不必做……”，言下之意是做了不必做的事，并表示过去时间，完全符合句意。A、C都表现在时间；D表示“本不该……”，表示懊悔做了不该做的事，放在句中句意显然不合适。
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