Question

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

 

Answer 1

that　

【解析】考查强调句。这是强调句的一般疑问句，正常的语序是：“It was because of the heavy snowstorm in Europe that the flight had to be put off.”，被强调部分是表示原因的状语。