问题
选择题
Cathy is taking notes of the grammatical rules in class at Sunshine School, where she ______ English for a year.
A．studies
B．studied
C．is studying
D．has been studying
答案
答案：D
本题考查时态。分析语境可知， 此刻Cathy正在Sunshine School的课上记语法笔记， 她在Sunshine School已经学英语有一年了，说明她已学一年目前还将学下去， 所以用现在完成进行时。答案为D。
有机物可能的结构简式。