问题补充：
the heavy snow in America, many people had to stay at the airport and couldn’t celebrate Cristmas with their family.
A. Because
B. Thanks to
C. As a result of
D. As a result
答案：
A. Because
B. Thanks to
(答案→)C. As a result of
D. As a result
解析：Because后面要跟句子，而the heavy snow 是名词词组，排除A；Thanks to多亏，幸亏，不符合 句意，排除B；As a result后面不能跟宾语，所以选C。
