SAT语法 文章题
问题描述：
SAT语法 文章题
（ ）an obvious life-serving goal,as they do in other behaviors such as finding food,mating,and resting.
A.play does not help those animals achieve
B.when they play,animals do not achieve
为什么A错了
答
因为A的主语是play,而as引导的并列句的主语是they,显然不符.