问题
选择题
Helen is 15 years old, and Joan is 15, too. So Helen is________Joan.
A．as big as
B．as older as
C．as old as
D．so old as
答案
答案：C
题目分析：句意：海伦是15岁，并且简也是15岁。因此海伦是和简同样大。考查固定句型：as……as与……一样，中间接形容词或副词的原级。本句表示的是年纪一样大，故选C