问题
选择题
Trees and flowers ________every year to make our country more beautiful.
A．is planted
B．was planted
C．are planted
D．were planted
答案
答案：C
题目分析：句意：为了使我们的国家更美丽。每年都种树和花。动作的承受者作主语，用被动语态。其结构是，主语+be+done。every year，每年，故用一般现在时，故选C