各位大神,还有一个问题呢。我记着那个Manhattan GMAT的SC里说过这样一个rule: Do not use a comma before and to separate two verbs that have the same subject.
Eg: Earl walked to school AND later ate his lunch.
Earl walked to school, AND HE later ate his lunch.
WRONG: Earl walked to school, AND later ate his lunch.
正确语序是:"researchers have discovered that A scrub jay can remember......... , and tends to ......." 按照意思来说tend应该是不能够can的,所以平行的不是remember. 直接排除 A,B,C. 然后固定大牌 tend to do sth. 选择D