我们不得不取消野餐,因为突然下起了大雨。

We had to cancel the picnic because it suddenly started raining heavily.

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We had to cancel the picnic because it suddenly started raining heavily.

had 是 have 的过去式,在这里与 to 连用构成 had to,表示"不得不",强调由于外部原因而被迫采取某种行动。

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