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16．昨晚一定下過雨了，因為今天早晨地面是濕的．（對過去事情的推測）It must have rained last night for the ground was wet this morning．．

分析 It must have rained last night for the ground was wet this morning．

解答 It must have rained last night for the ground was wet this morning．
這是對過去事實的一種肯定猜測，所以用情態(tài)動詞+have done來構成主句的時態(tài)，而原因狀語從句中表示的是過去的事實，用一般過去時．
分析句子的意思可知，地面濕是下過雨的一種直接原因，所以用連詞for來引導原因狀語從句，must have done過去一定做過某事．

點評 翻譯題在解題時首先要確定好句子的時態(tài)，然后要把握好短語表達，最后要注意句子結構．

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