问题
选择题
Was it because of the heavy snowstorm in Europe the flight had to be put off?
A．which
B．so
C．why
D．that
答案
答案：D
本题考查强调句。强调句结构为：It’s + 强调部分 + that从句，本句强调because of the heavy snowstorm in Europe部分，选D。
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