It is because of a rise in air fares ______ they've surcharged us 10% on the price of the holiday.
【正确答案】
A
【答案解析】考查强调句式“It is+名词／代词／介宾短语／从句等强调部分+that从句”，因此答案为A。题中强调部分是because of a rise in air fares，正常语序是They've surcharged us 10％ on theprice of the holiday because of a rise in air fares．