Was it because of the heavy snowstorm in Europe ________ the flight had to be put off?

 

that　

【解析】考查強(qiáng)調(diào)句。這是強(qiáng)調(diào)句的一般疑問句，正常的語序是：“It was because of the heavy snowstorm in Europe that the flight had to be put off.”，被強(qiáng)調(diào)部分是表示原因的狀語。

 

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