High school students continue to work hard they often complain about great burdens and p

问题补充：

High school students continue to work hard, they often complain about great burdens and pressures in their life.

A. as if

B. as long as

C. unless

D. even though

答案：

A. as if

B. as long as

C. unless

(答案→)D. even though

解析：考察连词辨析。A似乎，好像；B只要；C除非，如果…不…；D即使，尽管；句意：即使高中学生经常抱怨太大的学习和生活压力，但是他们仍然继续努力工作。根据句意说明D正确。