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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